What I was taught/shown was to buy some sets of shoe strings and put in my pocket when hunting game I was going to clean and eat. First thing when dressing a male animal use a shoe string to tie the penis so no urine could escape, if a female cut around the vagina and tie if off. Cut around the rectum and tie it off, then cut the throat and pull out the esophagus and tie this off. You have now sealed shut as well as possible the major sources of contamination to the meat. Now all you have to do is gut it without cutting a hole in something you should no cut a hole in. As to kooling down the meat and parting out the animal into eatable portions I have nothing to add to previous posts.