Tile Install Labor Cost: 1st Rehab Project!!

[Alex Mendoza]

Greetings Bigger Pockets! I am working on my first ever rehab project ... all thanks to Bigger Pockets, it's amazing content, books, and all the feedback and input I received from all the members.  Never thought I would be working on my business, but here I am!! 

I'm installing tile on my rehab in Dallas, TX.  I have all the tile (includes all floor and bathroom tiles), so only need the labor.  I asked a few contractors for bids but what I'm getting in return varies wildly -- from $4,200 to $15,000 -- again, this is for labor only (I'll also purchase the materials for the install).  Tried to look up some info that could give me an idea of a good "per sq. ft. price" or something similar, but nothing.  

Does anyone here have an idea on a reasonable price for tile install?  Please help.

Scope: Floor tile (6X48) that looks like wood, subway tile in bathrooms, and other hex (mesh) tile on the shower floor.