Generally, the ticks that will be latching onto you will be at the nymphal or adult stages. Adults don't get as much of a chance to feed on humans, because our skin is sensitive enough to feel an adult tick crawling around looking for a spot to dive into. The nymphs, though, are most often too small to feel. An attached tick feels amazingly like that last bit of scab covering a healing cut or abrasion just before it is ready to fall off. Of course, when you try to brush it off, the tick is not going to go anywhere.
Ticks usually begin their ride from low levels.
Nymphs generally lurk at ankle level or below, and adult ticks are usually found on plants growing below knee level. However, ticks are climbers. Once they are on for the ride, they head uphill, and only select a feeding spot when they cannot climb any higher. However, they also climb convenient objects, such as trees, while they are waiting for month after month for their meal ticket. So, you can find a tick anywhere on your body.