Water when the soil is almost dry. They need to be watered heavily so the plants get enough moisture. However, lavender plants must also be watered infrequently so the roots aren't in contact with moisture long enough to rot. Depending on where you live and what season it is, infrequent watering could mean weekly or biweekly. Shade reduces growth and fragrance of the lavender plants. Place on concrete surfaces in cooler temperatures to amplify the heat the plants receive. Freezing temperatures and snow aren't handled very well by lavender plants. One danger of leaving your lavenders in pots in the cold is that if there is enough moisture in the soil, it could freeze and crack your pots. The plant can handle the freezing, but your pots are less likely to. Lavenders should generally be pruned around August, but pruning time varies depending on what your climate is like. Use a pair of good pruning clippers to snip bunches of the stems away. As a general rule, prune at least a couple of months before winter sets in. Pruning a large lavender plant will take very little time with good pruning clippers Snip the stems about three fingers above the new stems that are springing up around the base of the plants. Pruning each year can potentially extend your lavender's life to ten years if your climate will allow the plant to live through winter.
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One-sentence summary -- Drench your plant in water. Place pots where they will get at least 6 to 8 hours of sunlight. Store your potted lavender plants in a garage or indoors during the winter to protect them. Prune your lavender plants.

Again, choose heavy books to provide the most weight. Stack them somewhere they won't get knocked into easily. You could also use bricks instead of books for the same effect. Set a reminder on your calendar to check the flowers after a few weeks have passed to see if they're done. They should feel like fine tissue paper. If they aren't done yet, carefully shut them back into the book for another week to continue pressing them. It takes less time to press flowers with heavy books than if you were to use a wooden flower press because there is considerably more weight being applied from the books.
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One-sentence summary --
Stack on 2 to 3 more books to provide extra weight. Leave the flowers alone for 1 to 2 weeks to allow them to dry out fully.