Changes

The best advice I can give you is to not wire everything up exactly like you want at first. In fact, disconnect the wires connected to the output jack from whatever they are wired to (most likely the pickup selector switch and/or volume/tone pots). Install the new pickups into the guitar body, but don't wire in their electronics. Use some gator clips to connect each pickup directly to the output jack. This is like having volume and tone set to 10 (actually maybe a little hotter and brighter). It will give you a quick means to demo the pickups extensively before deciding they are keepers and wiring up the full circuit with volume/tone knob, pickup selector switch, and other frills/options.