Yes 4 tips.
A, Number 1 rule. don't cut it until you are like done with your truck..
Leave the extra on runs coiled up and taped somewhere.
Because unless you are doing the whole truck in one go its a real pain to have to add more wire to something you had to move to put the "new part this year" in. AND its just one more connection point to have to check if something is not working.
B, Number 2, start with your rear runs first then to the front. It will give you a good indicator of you mounting options for fuse box. Without having to add wire. Especially important for long bed guys.
C, Number 3, Buy a kit with the wires labeled. Yes color coding works but it sure is nice grabbing a wire and is says right on it what it does.
D, Number 4, (should be number 1) Plan ahead. write up what you need to wire now. Then what you need to wire in the future, Then buy the kit that meets all these needs. Better to have the extra.
We can talk specifics once we know what your plan is for your ride.