It is not easy but certainly doable with both commitment and time.
By law, any unfavorable information in your credit file can stay there from 7 to 10 years. Today, however, a creditor must remove credit blemishes in a timely fashion if you challenge them and they turn out to be false.
The first step in any recovery plan is to get copies of your credit records. You are entitled to free copies if you have recently been turned down for credit. Otherwise, request copies for a fee from the three major credit-reporting agencies: Experian, Equifax, and Trans Union.
If you see any incorrect information, let the credit reporting agencies know. Also contact the companies that reported the negative claims against you.
If the credit report is correct, move immediately to take care of any outstanding delinquencies, tackling a little at a time until you get back on the right track. In fact, make an effort, if at all possible, to repay your debt in full and on time for six months to a year to prove you are working hard to repair any damage.