Yes believe but belief means more than that even the demons believe and tremble To have the assurance of salvation one only needs to repent and ask Christ into their life Head knowledge will not save you. Only crying out to Christ, asking Him into your life and accepting His finished work on the cross as the payment for your sin will achieve your salvation He has done all the work, all we have to do is acknowledge our need and accept His grace freely offered
Living the Christian life does involve confession to Christ our high priest alone. We daily lay our sins and shortcomings at His feet, die to sin and Live as Christ He is all in all.
Good and touching thoughts all...but Christ established, while He was here on Earth, the way that He wanted and expected it to be done....that was through the power and authority of the Catholic church. The "do it yourself" or follow the latest fad really doesn't get it done.
http://scripturecatholic.com/confession.html#confession-I
You need to both believe and repent.