Big box stores aren't known for paying a whole bunch of money for specialists. If you're worried about a hack job, find a small independent shop where the owner is doing, or involved in the quality of the install.
Check the t4r or ih8tmud forums. Ask there. I have found that whenever I need something done on my 4runner, usually someone there has already done it and has posted a how-to in the forums, or someone local is willing to meet up with me and do the labor for pizza and beer.