There are a few basic parts of the extension ladder that you should be familiar with before you attempt to use it. Here are the most important: The safety shoe or foot of the ladder consists of the pads that are designed to be in contact with the ground when the ladder is in use. These typically will swivel or rotate slightly in order to be make better contact with the surface the ladder is on. The fly section is the portion of the extension ladder that will be extended upward. This is the portion that you will climb as you get closer to the top. Additionally, it should be noted that some extension ladders have a two-part fly (and three primary ladder components in total). The base section is the portion of the extension ladder that will remain in place. When you begin to climb the ladder, you will start out on the rungs of this section. The rung lock is attached to the fly and is used to keep the fly in place by fitting over the top of a rung of the base or fly section underneath. It will essentially act as a bracket, and the fly will not be able to slide down after weight if put on it. The rope and pulley are used to extend the largest of extension ladders. Smaller ladders do not have this component, but larger ones are essentially unusable if this is broken. Serious injuries resulting from the use (or misuse) of extension ladders are so common that they have developed a bit of a reputation. Knowing how they earned that reputation--and how those accidents could have been prevented-- can help you stay safe. Extension ladders typically only have two points of contact with the ground. Some varieties of smaller ladders fold out to create four separate points of contact with the ground. Extension ladders typically have nothing other than the "feet" or "shoes" on the two side rails. Consequently, they can be a bit unstable. Extension ladders are among the tallest available in retail sales outlets. It is not merely that their height makes for longer falls (though that is true as well). Instead, the height only accentuates the preexisting instability issues. Think of the ladder as a lever. When you climb the ladder, the weight is actually moved closer to the end of the lever. People commonly misuse extension ladders. Because of their instability issues, there are certain precautions that must be taken. First, two people must be involved in the use of the ladder. When one person climbs, another must be available to "foot" the ladder (hold it in place). Secondly, the ladder cannot be used a vertical or near-vertical angles. Instead, they must bed tilted or leaned on to another object for support as a person climbs to the top (more on this in a moment). This will minimize the "leverage" issue previously noted.
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One-sentence summary -- Familiarize yourself with the parts of the extension ladder. Understand why extension ladders are considered dangerous.

To print on a t-shirt using a stencil, you only need a few basic supplies. You may have most of them around your house. If not, you'll find what you need at a craft or art store. Round up the following materials: A t-shirt. A plain, basic cotton t-shirt is fine. Know that some paints and inks will bleed through thin cotton, so if this is a concern for you, you might want to choose a thicker blend. The color you choose should be light enough (or dark enough) that the paint colors will show up well. A stencil. You can buy a pre-made stencil from a craft store or make your own using cardboard. Paint or ink. Acrylic fabric paint is a good choice for printing on t-shirts. You could also go with a fabric ink or stain. Look for a type that won't come out in the washing machine. A small paint roller and paint tray. You'll need this to apply the paint to the t-shirt evenly. If you don't have a roller, you can use a wide paintbrush. Tape. This is to hold the stencil in place while you apply the paint. Masking tape works well for this purpose. Cotton t-shirts shrink in the wash, so it's important to run them through the washer and dryer before you print on them. If you wait until after you print, the design might end up getting warped. When the t-shirt is dry, iron it to remove any wrinkles. Lay out some butcher paper or scrap paper on a hard, flat surface. Place the t-shirt on the surface and straighten it out so that it has no folds or wrinkles. Place the stencil on the part of the t-shirt where you want to print the design. Tape the edges of the stencil to the t-shirt to hold it in place. If you're worried the paint is going to bleed, place a piece of cardboard inside the t-shirt; this will prevent the paint from seeping through the shirt to the other side. To prevent paint splatters from getting on your nice clothes, you might want to put on an old t-shirt before you start painting. Pour the paint into the tray. Roll the roller over the paint a few times so that it is distributed evenly around the roller. Do a little test roll on a piece of paper. Using firm, steady strokes, use the roller to fill in the design in the stencil. Cover the entire design and overlap the stencil by an inch or two. Take care not to accidentally apply paint to areas outside the stencil. Carefully lift the stencil from the t-shirt and set it aside. Now wait for the paint to dry completely before touching the t-shirt again. Once the paint is totally dry, place a clean cloth (such as a thin dishcloth) over the design. Set the iron to high and iron over the painted area of the t-shirt. This helps set the paint in place so that it won't easily come off. You're now free to wear your new t-shirt. Wash it by itself using cold water the first few times it gets dirty. With time you should be able to throw it in with the rest of your laundry.
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One-sentence summary --
Gather supplies. Launder the t-shirt. Set up your work space for printing. Prepare the roller. Paint the t-shirt. Lift away the stencil. Iron the t-shirt. Wear and wash the t-shirt.