I am about to bite the bullet and purchase the dash harness from Year One. I am wanting to know if this is a job I can do with the dash in the car. Is it much easier to take accomplish this mission with the dash out? Currently, all of the interior is out of the car, and I could throw a thin mattress in there for comfort. I already know it will be a battle for me since I have never installed a dash harness, and I know very little about this stuff. Fortunately, the old harness is still in there, and I can take pictures and know where everything is supposed to go. I guess what I am really asking is...how can I make this easiest on myself and do the job right?