Thanks! You are acctully the first one who answer my question!
To all others:
I have already been using Google's keyword planner. I have found keywords I would like to use, but here I can only see how many monthly searches a keyword has hand what the competition are on AdWords. Now I have started to Google Search the keyword and see what sites are currently ranking.
My question was how do I see how hard it would be to outrank the sites that are currently on top?
For example (google search on keywords):
#9 non-niche related personal blog (the blog is big, and probably got tons of backlinks. but does only have 1 blogpost about the niche)
#4-5 and 8, niche related sites.
#1-3 and #6-7 are local newspaper sites, with tons of backlinks. But they are not related to the niche and only ranking on 1 article each.
Would it be hard or easy, to out rank sites with tons of backlinks, if they are not trying to rank on the keyword I am trying to rank for (like #1-3, #6-7 and #9)