Gareth, I don't know you personally and therefore cannot vouch for you, sorry mate but that's the truth.
What I can say is this, prove your honesty by sending whatever you are selling prior to being paid and whoever you have done the deal with, they will send the money after they receive the dosh.
This is of course contingent on the buyer being a trusted member but that can be sorted out pretty easily.
It's an easy and simple way to get what everybody requires.
I will not and cannot vouch for people I do not know personally for obvious reasons.
Earn your stripes Gareth and then all will be fine mate.