I did a 5x2x30" 190g myself in my living room. Do it yourself! open all the windows though, and be careful, the sillycone fumes will knock you out.
I also changed this same tank from a center overflow box to the back wall.
Get yourself some 90* clamps from lowes, the more the better. You can see them in place in the photo. Also, get some good strong help to assist you in setting the glass. Save yourself some money and do it yourself!