+1 on what Junkie said about the wound-vac. I don't know if it is a viable option regarding the size of your wound, but it kept me from being an above-the-knee amputee and kept me away from many of the usual bouts of infection (and resultant tissue removal) usually associated with the type of dirty wounds (lots of trash, dirt, and debris) I had. My doctors were amazed that I never experienced any type of infections after all the severe trauma to the tissue and 15 surgeries. I credit the wound-vac, the tediousness of care of the nursing staff, and how well they trained my wife for the after-care at home.
Also, ask about the non-stick wet-style gauze pads. They don't stick to the wound and make bandage changes easier. I think they are coated with an anti-bacterial vaseline based ointment, but still allow the wound to breathe.
Junkie pretty much nailed it, though......wash hands and clean, clean, clean.
Either way, good luck on the healing and I hope you mend well.