Biggest hint from me is to learn to forgive yourself. You will make mistakes, you will get addicted...just remember all of us have been there too. And some of us still are making mistakes! And spending lots of dolly dollars. If you start out realizing that you won't be perfect all the time, you can relax and have fun. Plus you get to play with us!
Other big advice is to use those coupons at Michaels and get paintbrushes! Go to thrift stores for paint plates. And then go to the thrift store for a big cabinet to put everything in. And a second cabinet for the baby clothes...and a changing table... And baby clothes...did I mention the addictive part. You know you are one of us when you think about baby stuff in every store. Last thing is to buy seconds kits to practice on. You can always sell them or give them away.