The Sacrament of Confession is a great gift to the Church, if we are open and willing to accept it. The priest is there to be a vessel of Christ's love and forgiveness, not of judgement or scolding. So if you've been away for a long time, or you don't remember the words or prayers, don't worry. Just simply tell the priest and he'll be glad to help you.
Below are some links to tips on how to make a good confession, as well as some FAQ's on the sacrament.