Learning Switch and nollie?

first question..... practice on your timing...it's all about tha timing...obviously you already know how to do them normal so you don't need help on the mechanics.....second question....you have to get more speed than usual and not try to go forward... try to stay over your board like as if you weren't even moving. and obviously you want to do the nollie or fakie trick a half a second or so before you would do the normal trick because your back of your board is lifting up first instead of your front.