Repair Bad Credit

should i pay someone to dispute items on my credit report to repair my bad credit?
I am about to graduate from college and I would really like to improve my horrible credit score (541), all of which come from charged off credit cards when I first started college
A friend of mine found this guy who she says repaired her credit for about $500 by disputing negative items on her report and getting them removed, which made it alot easier for her to get a new car, and soon she will by buying a house. Should I go to this guy?? Does that stuff really work?? I would like to do it myself, but I wouldn’t even know where to start and I would not have the time, especially with work and school… Most of the items on my report are 2-3 years old… I need advice!! Please help me improve from a 541…
you can do the sdame thing yourself.all it will cost you will be cost of return receipt registered mail.and it dont neccessarily raise your score.go to www.annualcreditreport.com,get copies of your credit reports and it also tells how to dispute items on there.