Why do you have to instruct your customers? They just give etsy their cc #, it is all done on site, so less steps than paypal
Paypal only lets you use a credit card without joining 3 times, then they have to join.
I use stamps.com, but in the beginning I was shipping through paypal.com/shipnow
I have had DC for 3 months and have not had a single problem, and buyers love it.