I’ve bought and sold 000’s of £’s worth of stuff on here since the very early days of the forum – I’m a total bike tart and can’t seem to stop myself….
…anyway, enough of my problems….
The very best way is to set yourself up a PP account and go learn how to use it (not hard) as I find that these days it’s the payment and clearance of a cheque that takes all the time – remove that and you have almost instant payment via PP and usually get your stuff within a day or two (witness my purchase of a 36t chainring on the form this week)
As for trust – this is a great place (as is Retrobike) – other sites not so good. Always look for people with a history where poss; even ask for a look at their ebay history if they have one…..