Just pretent like your a normal seller of an wow char, mostly on Ebur.de - Druckmesstechnik Resources and Information. This website is for sale!, and make a detailled post of an char you found on wowarmory.
Speak with multiple people who want to buy your char, that you dont have without showing ingame, some noobs will believe you if you say that your playtime is down..
Else, pretent like you are going to buy an char, and to someone else pretent like you are selling the same char, if you handle this right, you may try the char.. and in that time give the information, to the guy who wanna buy from u, timed correctly will let him pay u..
Seller - > Nothing, or recalling his acc..
YOU - > €€€€
Buyer - > The Wowaccount, or prolly Nothing!
Just commense sence, i will give a more detailled guide later