The Tape Wrapping method is for gradually going up in size- you don't wrap a bunch at one time. You only do 1 or 2 wraps around your jewelry every couple weeks.
The Tape Method is MUCH cheaper than buying all those tapers and jewelry.
It's very dangerous to skip sizes, as you can literally tear your lobes. It also cause scar tissue, which can make stretching larger a lot more difficult, or even impossible.
You must use only PTFE tape (the teflon tape), or bondage tape.
You can find the PTFE tape at any hardware store (it's plumber's tape), and can find the bondage tape at Spencer's or, any other adult store.
Bondage can be used because it only sticks to itself, and not skin.
Electrical tape, medical tape, and duct tape will wreck your jewelry (I'll be honest- I've tried them). And medical tape, after a few days, breaks down, and the adhesive starts to seap through the tape and into your ear (not fun- have had this happen too). That kiiiills your ears, and sucks to clean it all out of your piercing. I also had to throw my jewelry away.
You think because it's medical tape, it'll work fine, but it's horrible.
A lovely stretching FAQ:
http://bodypiercingtattooingandbodymodification.yuku.com/topic/3871/t/Stretching-FAQ-Please-Read-First-Updated-1-21.html