Always "try to put milk back in the cow" so to speak by trying to re-negotiate the price after the work is done.
Be insulting, by asking if the electrician can enter through the "service entrance", then lead him to the work to be done at the front door.
Speak only through the maid, who barely speaks english and has no idea what it is that you want.
Step out for coffee, for several hours, 2 minutes before the scheduled appointment with the electrician. When he tracks you down via your cell phone, act surprised, and say, "Well you trades people are notorious for being late, I thought I had plenty of time."
If you're a GC, call several weeks ahead of schedule, say you're ready for rough wiring, while you're only half way done with framing.
Never over-lay your plans, and have everything in the center of each room. Let the HVAC, sprinkler guy, and electrician battle it out for placement, and do all you can to "stay uninvolved".
When decisions or clarifications need to be made, sit on the list until it is at least 5 pages long, or 2 months, which ever comes last, act "over-welmed" and only attempt to solve a few of them at a time.
And......
Try to get the Electrical Contractors employees to do work "on the side" for you!