Awesome! The world needs more B3 Coupe 20VT cars.
Regarding the wiring, I would recommend one of two options.
1. Pay a professional to do it. This will be expensive, but a resource to return to when things aren't working right.
2. Do it yourself. This way when something doesn't work, you can track down the problems and fix them. Having intimate knowledge of the wiring of the car will be very useful in the future.
Having a buddy do it would be the last thing I would consider.
In general, for the wiring (assuming that you have an essentially bare chassis, with all the wiring in a bin) you need to separate the engine wiring from the chassis wiring. This is tedious but not impossible. A Bentley manual or good copies of the electrical wiring diagrams with the colors will be essential. You would keep all the chassis wiring (instruments, seat power, window power, etc. etc) with the car and reinstall what you need. Label as you go and expect to spend 20+ hours on this.
Then you need the AAN harness (assuming you are using the AAN ECU). There are a few points where they merge that are outlined in various posts.
Get the right tools.
You need a pin-removal tool to release the pins from their connectors.
Get a ratcheting crimp tool to make any crimps. Use good quality Open Barrel connectors for all the connections (not the Red/Blue/Yellow crimp connectors sold at your F.L.A.P.S.)
No solder on automotive wiring connectors
Tesa 51036 harness tape is good for the engine compartment use
Tesa 51608 cloth tape is good for inside the car
Come here for help.
I'm sure I'm forgetting something.