Okay, if you really want to do this mattw,
I use a Coldsteel Ti-Lite for this job. Pinch the belly skin and make sure you get it away from the gut and covering. Pull skin up between finger and thumb of left hand and insert knife tip cutting toward head (so blade is uppermost - you knife shoulld be SHARP). Push towards chin.
Having completed vertical incision, remove all limbs at the "elbow / knee", by pull / twist motion to disengage and then cut through tendons.
Remove head above shoulder line.
You can now insert your thumbs between flesh and skin and work the skin off and over the limbs. You will need to use a kinfe tip to cut around the anus.
You should now carefully remove the guts. I do this in a "spatchcock" manne by splitting upwards through the breast bone and then scraping the lot out with an index finger.
HTH
Red