That's not what "try and" means though. It's perfectly fine to say "I'm gonna try and fix this" when you don't know if you can fix it.
(Source: I say that shit all the time).
Then there's people like me who use the popular contraction for the first three words: "Ima try and fix this."
A contraction containing another contraction, in fact.
That sounds horrible to me. I’m going to try to fix it.
I would only say "try and" if I thought it was likely that I'd at least make some progress towards the goal.
If I expected failure, I'd instead say "try to" fix it.