gm-8 in pelican case

could some tell me the easiest and best way to make sure i get my foam plucked properly and get everything in the case without a problem. do you guys put the motors facing towards the top of the case or the bottom? do you outline on the part that you can't pluck first or do you just wing it? any help would be appreciated. also i have looked on the forums and saw on case with gm-8 head fitting nicely i just want a step by step process. thanks dan