Give IT One's Best Shot(try hard)
Can you so anything about repairing this TV set?
I'm not much of an electrician, but I'll give it my best shot.
Many thanks. I'd be most appreciative.
OK. I'll try my hardest to fix it, but I'm not promising that I'll succeed.
At this point, I'll take all the help I can get.
I'm not much of a cook, but ~ = 料理には自信ないが、
be most appreciative = be very thankful most = very much