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I was wondering how much it will cost me to have thse tires installed. I only ordered 2 because I have 2 new yokohama tires already on their on the back. So, I will need them to put the yokohamas up front, take the other two tires off and switch them with the 2 new Goodyear f1 gs-d3's.

 

Just ask around your local shops. This will vary greatly.
I usually install my tires at Walmart... very cheap, but they won't do 17" 40/45 profile tires so I took them to a different place in town and they charged me $25 per tire for install and balancing.
At Walmart, it's like $5 per tire.

 

last year a local tire shop charged me $12.50 for mount and balance.

this summer i paid $10 to mount and balance each.

just call around...smaller shops sometimes won't give you hassles if you are running tires that are on the extreme of "recommended" size for a rim.

 

If you buy your tires through a shop that sells through tirerack.com when your tires come in they will mount and balance them for free... not to bad if you ask me... plus you wont have to pay the outragious shipping charge..