Well, on my 91 Accord, I used a 30mm socket. If you don't already
have one, get a 6-point socket so there's less chance of messing up
the bolt.

There's enough flex in the lines on the Accord to not have to remove
them. Oil up the new o-ring and slide the assembly in nice and easy;
you can't really see how well it goes in, but if your fingers aren't
frozen solid you can feel if anything binds and pulls the gasket off
the mark (and you'll end up with a leak again...).

The dealer quoted $150 for the job. And it only took me about a half
hour (and a $5 gasket) and I'm really slow.