O h boy were should i start!!!!
Ok ,what typ of chop do you want ? is the first thing to deside ,and how much to remove is next.
Traditonal ,custom or the hammerd look[my personal favrit!]
Door glass and vent windows can be a big issue to consider also.
Try to find a tex smith ''how to chop tops '' book [speed way sails them ]
Theres step by step how to's on 49 -54 chevy 2 doors in it among others .
I have done quite a few chops and will help if i can so just pm me if i can help you.
I will say to not let time be a desiding factor ,the more time that you take the better it will turn out [dont rush though it]