Just breast them out. The only bird I will completey clean is a turkey all others are breasted. This way you have meat that can be cooked many ways with no bones etc... I have a friend that takes the legs because of the meat on the thighs the leg part has to many tendons that are like small bones you get while eating fish, but he takes them for the meat on the thigh (pheasants). Then again he even takes the thighs off woodcock. Both have very, very little meat and while cooking you almost need to cook seperately because it can get overdone real easy. Most waterfowl hunters usually just breast them out there is not much other meat to be had and this practice has advantages on the table fare its delicious.

I would highly discourage from so called field dressing in the field for many reasons one is the birds cavaty if not kept clean can start bacteria growth or also have fly's lay eggs while it is in your carrying bag. Also with the threat of West Niles they recommend handling game with rubber gloves not say I do but I would like to wash up my hands as well as rinse the meat right after so I wait tell I get back to camp/home.