It's hugely difficult, often services offering links on High pr sites are talking about a site's pr7 home page, the actually page the link is on may have little ranking. One rank getting guide estimates that one pr7 backlink has as much ranking leverage as 30,000 pr1 backlinks, there are places offering to rent links on such high ranking pages for over $1000/mo.
There are scenarios, like perhaps getting in to write a guest post on an authority site where your post may briefly be listed on the home page's latest posts list, again your link would not be on a pr7 page but should get a lot of direct traffic for a short time.
There are methods to fake ranking, like a script that shows search spiders a high ranked page in place of the actual site. Some of these short lived high rank pages sell backlinks.
You can found alot this on web.
PR-7 is easy for Expat person, u at fast go google ( and than search 'put my link') and than 1st website is put my link, open it and search your won keyword,
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how to get free backlink from PR 7 site?
