Another trick for straight holes is to put something on the bit (like a washer or something that moves freely) and it should stay in the same spot. If it slides

Another trick for straight holes is to put something on the bit (like a washer or something that moves freely) and it should stay in the same spot. If it slides forward/backward the bit isn’t level. This probably isn’t a good technique for drilling pilot holes for a neck but it works well for things where a Good Enough™ tolerance is acceptable.