Thank you Scott Mac,
Yes, this is what I've been wavering on. I think the entire cost of the project will be in the $90,000 range if I hire a very big and reputable company. I think if I did it myself it would cost about $60,000.
What my friend did was hired a GC as a consultant but he actually scheduled the subs, bought the materials him,and applied for the permits. The GC spent about 2 hours discussing everything with him on the phone and then did spot checks after every individual portion of the job was completed. Paid the GC about $1,500 dollars for his time which was about 5 hours worth of work for the job and used his referrals for subs. Because my job is bigger I would likely pay around $3k for 8-10 hours of consulting.
I had to look up what a slump test was.
I want to read up on the scope of the work and things I would need to know but there isn't a ton of reading material for the novice. I'm not particularly set on which way I want to go just considering the option.