After about an hour trying to use keystone adapters to network a previously used cat5 for phone lines back into a server rack for network purposes, I realized that the best method is to just use a coupler. If the wiring is off on the cable routed through to the wall jack it can throw you off, so you have to rip the wall jack off just to confirm. As well you will need a punch down tool to make sure your cable is properly seated into the keystone adapter.
If your good at making cat5 cables you can just save yourself the trouble and put a RJ45 end on the wire, then use a coupler. couplers are about $5 a piece at the store but i’m sure you can get them cheaper in bulk online if you need several.