I’d say go and like @Thirdmonkey says have an exit plan! Also plan what you will drink/ ask for at the bar/ if anyone offers you one.
Loads more good tips etc here (including some just don’t go, but also strategies for when you do!) >>
I think being aware of the fact that it’s easy to slip is a good thing.
The most important thing is to have fun 
And if you’re not having fun - you don’t have to stay! Like @Ar7 I found having something to really look forward to in the morning a good motivator as I started going back out there.