I had a question regarding wire tucks in terms of fabricating....I know how to do one but it would require to cut and extend wiring... My problem is a whole car running on cut wires cant be that good. Or am I wrong in that its not how ppl do their wire tucks.

At least to my knowledge the best way I would try to do one would be to take each wire off the plugs and substitute the wire for one that has the "wiretucked" length...

Idk if im explaining myself right.. maybe im asking something stupid...

Any elaboration would be nice and thanks. I didnt know where else to post this.
Any pictures would be great