For your own safety, go to a shop, Discount Tires, Just Tires, Firestone, etc. and let them do it...I don't think they're going to charge you more than $30
And, for your own additional safety, check the lug nuts afterwards to see if they are torqued up. A Ford dealer once did an unauthorized "safety check" on one of my cars, and when I got home 7 or 8 of the lug nuts were only finger tight - if that.

