st185 3sgte swap into 3 door 98 celica. help please! Options

[98celi]

I started a 3sgte swap into my 98 celica just a few days ago. Everything has been going well so far, engine is in on 3 mounts ( fourth is poly filled drying currently) The problem I'm currently having iis being massively overwhelmed by the wiring. The harness was still on the engine when I bought it. Between coolant lines, vacuum lines and connectors I don't know where to start. I spent all day scouring through other forums and posts and haven't find anything as helpful as I'd like. 6 hours today looking at my engine bay and maybe two connectors plugged in. Any help or advice would be much appreciated

[98celi]

I now have a non wiring question. I do appreciate the help so far guys even with how generic my questions have been. With the engine I got an st185 top mount intercooler. I don't have the external water pump or the sub radiator, is there anything else I need for that setup? And in addition to that my plan was to find universal sub radiator and pump because the stock ones are either very hard to find or they break my budget. The only sub radiators I can find are actually fmic. They aren't just radiators but I was wondering if I can still mount one to the front and run the coolant lines to my top mount? I assume I'll also need a reservoir for the system.