As I was driving home from advanced auto parts today the head gasket blew out on my 96 Pontiac Bonneville. I'm 90% sure it was that due to the smoke out of the exhaust plus the smell right before it blew. I was at AA to get a code checked out, it was "multiple cylinder misfire" if I remember correctly, which would probably make sense. Now to put this into perspective I'm a 17 year old that lives by himself with a good selection of tools, I'm pretty mechanically inclined but I don't have a lot of money and I know getting it repaired won't be cheap. So I would like to know how hard it is to replace the head gasket on these motors. Thanks.