Just make sure to get his bloodwork done beforehand. How old is he, and why was he not neutered before you rescued him? Did you rescue him through an actual rescue, or did you adopt him from a private party?
Neutering is not as invasive as a spay, and your guy will be back to normal within a day or so.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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