Like the guy above me said, trust is necessary in business. If you are new you will be bound to go first[you won't find MM always] and will suffer high risk of being scammed too.
Newbies are treated more or less as scammers in many online communities like in the time they forget they were once a newbie as well.But while making deals with anyone just make sure they have got enough trusted threads or subscribed to membership,moreover use the middlemanship it would't take more than 2-5% of your total transaction.It's better than losing all the money or all your hard work