How Do You Trust Someone You Hire?

[Jeffery]

Assuming you mean giving the 'someone' access to your website, i.e. login credentials to your website's control panel, FTP account, etc.?

In my experience, I only hire people from word-of-mouth. In other words, a trusted colleague's recommendation. The covet is I often employ part-time webmasters (summer and holiday months) from our local college without a trusted colleague's recommendation based on the college's recommendation. That usually entails the college's placement program.

Now, if you are referring to a site like fiver, freelancer, upwork, etc. then I can't offer any experienced advise. However, you can grant temporary credentials to anyone. See your website's host guides for instructions. Personally, I would not trust anyone from those sites without a trusted recommendation from a colleague. But that is just me.