I've replaced just one banjo skin head, but I read around a lot.
In essence the process is simple:
1. Soak the skin for 15-30 mins in warm water until it is soft and supple. Check it from time to time, don't soak it longer than you need to.
2. Fix it in position so that it is taut with no wrinkles.
3. Leave it to dry (24-48 hours) - it will tighten up a lot.
4. Tighten up the head to desired playing tautness.
In your case that will require some improvisation. Looking at your picture, this is my best guess:
a. Staple the head in place using the coffee can to press the head down into its final position. With luck, if you place the banjo face down on a flat surface, the head will be in the right place if it is flat to that surface. If not, you will have to improvise something to press down against. Staple opposite sides, then at 90 degrees, then filling in the gaps with staples on opposing sides. All the time you will need to keep pulling the skin taut to remove wrinkles, whilst simultaneously pressing the head down to your surface with the coffee can (using your third and fourth hands, I'd think).
b. Loosely attach the back to hold it all in position to dry.
c. Once dry, tighten down the back to tension the head.
As I said, this is just my guess. Look at how the head has to sit when the banjo is set up to play, and modify as necessary from that.
And good luck! Worst case is you have the head too loose, or so tight it splits, and have to try again with another one.
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