Careful
Be sure to not tighten them too much. Average strenght with 2 fingers is enough. No tools!
The holes in the bodywork provide for a bit of adjustment, up and down, so as to align with the adjacent trim. Rear fender trim calls for the rear 1/4 light window mechanism to come out. I have done it once, with them in place, but the hazzle and lost nuts caused me not to try this again. On the latest door pieces, there is a locking piece at the "B-post" end which needs to be pushed out, cut and pushed back in, as otherwise you won´t be able to fit the locking piece at that rearmost hole.
Take your time and have fun !