As I'm sure some of you, maybe many of you, have not seen a plastic wrap sculpture before, I will show you some pictures first.
Step 1: Materials
Plastic wrap (What brand is up to you, some sticks better than others and sometimes you may not want that... so it's all up to you)
Packing tape (go for the clear packing tape for a nice clean look)
Scissors (it's not pictured but you need 'em)
An item to wrap (if it is your first/second try make sure to have something you don't mind getting cut a little. After you have some practice it is easier not to cut things)
Step 2: Wrapping...
Do not worry about detail in this step, for now just get the plastic wrap around the model not too tight.
And remember, don't be afraid to wrap it twice!
Step 3: Packing tape...
You will be taping everywhere on the model. Everywhere. This is another thing you don't want to muss up. If you don't get a spot the first time around you can come back with more tape. But after this step there is nearly no turning back.
Use your fingers to press down on the tape in certain areas where you want detail. The tape will typically stay depending on the brand.
If some tape is sticking out, feel free to just cut it off and tape over the area.