How many incoming links i need for getting PR5?

Oh my God, the thoughest part in getting a top rank is "backlinks".A site with pr 7 will never agree to have a link with my site, I have some pr 5 and some pr4 back links as of now and expecting some more in the coming days,
I read somewhere that backlinks are majorly responsible for PR they had written 35%.Rest 65% is title, keyword ........ Right now after reading all this I found one thing that there is no shortcuts, my site is only 2 months old and it will take atleast 6 months to get a good rank and a good position.

Thanks for all valuable suggestions

Josefina Argüello - Primero en Google