Never tell your password to anyone.
KnightFire: Hey, how can I help you?
Norbi: Hello, i saw your post on steamtrades, i would like to buy some keys. I also read that you never wanted to go first, so if we would trade, i would like to see your rep page(s) with all your rep, and if you have more rep than me, i will go first, and if i have more rep youll need to go first, or we need to find a middleman :)
Norbi: how many keys do you have?
KnightFire: I have 3 keys available.
KnightFire: You can check my rep by clicking on my name on my SteamTrades page.
Norbi: Do you think you have more in the future?
KnightFire: I might, but I can't exactly say when.
Norbi: Alright, well i would like to keep you in my friendlist, and for now i would like to buy the 3 keys for 1,85 usd if possible
KnightFire: Sure, can I see your rep page then?
Norbi: i also see that you have 20+ rep on steamtrades
Norbi: sure take a look
Norbi: http://www.steamtrades.com/user/Norbi
Norbi: i trade for over a year now and collected 250+ rep
KnightFire: Alright, I can go first
Norbi has accepted your request to trade.
Norbi: alright
Norbi: ill note "I will not refund this payment"
KnightFire: You're not the guy you say you are.
KnightFire: That isn't your SteamTrades rep page.
Norbi: ?
KnightFire: Nice try.
Norbi: it is
KnightFire: No, it isn't.
KnightFire: I clicked the profile linked on the page and it clearly isn't you.
Norbi: what is the difference then?
KnightFire: Uh, maybe the fact that the guy you linked has 529 games and you have 6?