+1

Always check all bolts go through a plate or whatever you are fixing
Check where possible the holes have got thread it, just because it's new doesn't mean it's threaded.
Dry run with just the bolts if possible in awkward situations to check the bolt fits and doesn't bottom out.

Start with an easy one in loosely just to get the plate or whatever in position then put the hardest one in almost all the way.
Clean / lube the threads if used bolts, nuts holes.
.