I check a lot of my seams with a ruler to make sure I’m on track. Sometimes I redo them, sometimes I trim, sometimes I can make it all work out by slightly altering the allowance of another seam or easing two seams together, depending on the situation. I also cut some things oversize and plan to trim.
It takes time to do all this (and is one of the reasons I’m not a prolific quilter), but I’m happier with the results and it saves me from discovering later that one of my blocks is too small or off in some other way and has to be completely redone.