I wrapped my own bars for the first time last month. I was worried because it seemed like if I messed up in the middle of the process it would ruin the whole thing. I bought two packages of tape because I thought the first one might just be a rough draft.
I managed just fine. Once I understood what I was supposed to be doing it was easy. My job doesn't look like a pro did it but I wasn't trying to skimp on tape either!
If I can do it, you can do it.