I wonder how do you check your website's SERP position for a certain query.

I cannot directly go to Google and search, because it knows i'm looking for my site, and it shows it in the first position, but from another browser, it cannot be even in the first page. So how do you check for "average user" ?

I use Tor browser for that, since it gives me a completely different IP, do you think is it safe? I mean, does it give useful information ?