Watch out for narrow spaces where they could squeeze in and get caught, also anything that hangs down (like window blind cords) could cause a problem. Baby gates and boxes don't work,they'll learn to climb them before you know it.

I thought of the climbing thing two seconds after posting. I just tied up our curtains. One (the one we feel we must have) is a huge climber.

Clear your tabletops, counters, and bookshelves of breakable items ... or wait for your kittens to clear them for you. Make sure all cleaning supplies and meds are in locked cabinets. Keep all strings, ribbons, yarn, etc. out of reach of the kittens - they are not safe toys.

Provide various scratchers and posts.

Most of all, tune up your sense of humor. You're going to need it!

Laurie