Trophy and Achievement hunters, When do you look at a guide?

[BHR-3]

i look at the trophy guide before even buying the game i have very few games that aren't %100 if theres a game that im only semi interested in the trophy list can make or break it as far as purchases go

when i look at a walkthrough not as often only if im stuck for more that 1/2hr or so collectables guides are mandatory for me as i want to do the least amount of playthroughs as possible