I've been cutting my own hair for a couple years now. I had it long for awhile and would just cut it all one length. Now it's shorter and I'd really like to do some layers. I don't want face framing layers, just layers that will let my hair lay a little better (it sort of mushrooms out now). Any suggestions/tips on how to do this without totally screwing up my hair? I really just want to do it myself and could care less if it isn't perfect. Thanks.