just pop into confession and come out and be a complete bastard again because your sins have been forgiven
Aha, you're not entirely familiar with how confession works are you? Unless you're sorry for the sins and are truly not intending (really…because Jesus knows) to commit them again, then sorry, no forgiveness.
Jeez, which reminds me of all the bunkum which was indoctrinated into us before our First Holy Communion. We were shitting ourselves going in for our first confession…"bless me father for i have sinned…then you'd go through the list…I'm sorry for being disobedient at home, I'm sorry for stealing the last biscuit out of the tin, I'm sorry for not wiping my arse after a particularly messy shit". The the priest would give you a lecture about what a despicable little sod you'd been, tell you to say two Hail Marys, an Our Father and a Glory Be. I still remember the feeling of complete relief when you'd come out of the confessional though. Certainly took a load off…
EDIT: Bear in mind that we were 6 or 7 years old when we were being told what evil little feckers we were for the first time. And all though the years I never once confessed to a bit of hand shandying. I know one fellow who claimed he did and he got nearly a whole rosary to say from the priest. He was in the church all night on his knees.