Route Setting is an art form based on creativity, hold selection, and knowledge of how different body sizes move. Setting a route is all about the feel. We highly recommend watching our video.
If you are new to installing climbing holds, here are some tips to ensure that you don't cross-thread your T-nuts. Begin by inserting the bolt through the hold and hand-thread the bolt into the T-nut. If you feel ANY resistance to the bolt engaging the threads of the T-nut, stop and take the bolt out and look into the T-nut. You are looking to see if the T-nut is crooked in the hole. If the T-nut looks straight, check the threads on the bolt. Bolt threads can be easily damaged if inserted into a cross-threaded T-nut, so your first step is to switch out the bolt and try again. If the new bolt resists going into the T-nut, then you should assume your T-nut is cross-threaded and needs to be tapped. Don't worry! Follow this link: How to Tap a T-nut