Yeah, I feel your pain. Two ways, take off the front end or go through those wheel wells. I didn't want to spend the time for the front end, didn't have a helper either. Obviously that would make working with the wires far easier, if I did go that route then I would have spent the time and used other connectors or soldered, but like I said I've used the taps many times before without issue (only where the wiring isn't exposed to the elements of course).
So while going through the wheel well arches were a pain in the a$$ and my forearms took a beat down off the plastic liner and fender (note to self, next time wear something to protect the skin!) thats the way I did it. I literally had do squeeze them down by touch - you can't really see what you're doing way up there, then I reached back with pliers to make sure they were clipped down properly. It really doesn't take much the tap only has to make some contact with the wires to put resistance on the circuit.
Buy some and practice on some other spare wire you might have if you've never used them before. I know some people hate the things but they do work in this specific type of environment up there. If you're going to drive through a swamp so water comes up over your hood - they may not be the best option for the long term.
Cheers ...