I was thinking of hiring someone from DP to do some search engine optimization on my site, and get it ranking higher in the serps. I then thought, what if after the deal, they plan to sabotage my site (ie: bring down my site in the rankings by pointing it from bad sites).

This is one of my biggest concerns when hiring someone to do work on my site. You never know who it really is, and they could easily perform some bl4ackh4t techniques on your site. They could even be your competitor.

I am really thinking of hiring someone, but I just can't trust someone on the other end who I never met.

Have you guys thought about this, or any opinions you would like to share?