just explain that you'd prefere to have it picked up but you'll offer to ship, but it will likely cost a bomb - you should get a quote for shipping in the USA - remember to include the weight and cost of packaging!
as far as buying... look for sellers with awesome feedback, and well detailed descriptions - and don't be afraid to ASK before buying!
also, if you had 0 feedback, you should maybe try n buy one or two things (maybe a pack of strings or a cable) just to prove you are a worthy seller. if in the case you are a new ebayer, be as precise as possible - this will also put faith in prominent bidders
