Another important note. Take lots of pictures and notes for each picture of what comes apart and what goes where.
Mine is not my daily driver nor is it in a garage and i did it during winter. I'll say it took me a month or 2. Mine did not have terminals so I spent a lot of time soldering.
Not sure if your current fuse box is the original. If it is, it has one bolt going right through the center holding the outside harness to the inside.
I got confused in a few areas when re wiring and had to look at the old fuse box. The biggest confusion was the new harness had a power wire for the heater and a power wire for the gauge cluster and on the original the power for the heater, piggybacked off the power for the gauge cluster wire.
If you're going to cut wires to solder later on to the new ones, leave plenty of length on the old in case you make mistakes like soldering the wrong wire.
Since we don't have computers, the install is easy. Don't know what gauges you have, mine had idiot lights. Now is the time to research and buy a tach, oil pressure, temp, and batt gauge cluster you like.
Buy grommets too. a nice variety pack.
Also What not to break!!! When you are unbolting the steering column to drop it, for the love of God, undo the the GEAR SHIFT INDICATOR CABLE!!!! It's one tiny screw on the right side of the column.
Think about things you want to do behind the dash once you have it out. I bought all new shiny chrome ac vents and got some plexi glass and made all new lenses since mine was all scratched up. Even sent my fuel gauge off to be re calibrated and painted.
Also it's a good time to lube the speedo cable or replace it.
Keep an eye out for any bad, broken, corroded or burned wires and connectors, so you can buy those too if needed.
Also my headlight switch harness was wired a bit different than the way it came from the factory and took me some time and emails and research to figure out. I'll find my thread i posted back then.
OHHHH yeah. One mistake I made was trying to pull the rear wire assembly through. I left the zip ties that kept the wires bundled together on. One of them got wedged permanently between the wheel well and the body panel. I ended up breaking a wire or two. I'll find the pics I took on how to safely feed those wire to the back.
Here is a thread I started when i first joined. Pages 4-5 were when i was wiring. There's a lot of wiring schematics too if you need them. Gilby is an electrician, but don't tell anyone I told you.
http://www.elcaminocentral.com/showthread.php?t=54503
I'm sure I will think of other things I broke or wish I had or had not done .
There's a lot of wisdom on this site and everyone was most helpful to me.
You will enjoy being able to say "I did this" and you'll feel better knowing you have all new wiring.
Don't be afraid to ask any question.