That's a wise decision. Dealerships aren't really expensive apart from the spare parts (which you can choose to buy from the scrap yard - they have no issues with it)
I went to Honda Fort yesterday with a friend who had spent almost 40k on his City iDsi with different mechanics and still it didn't give the desired results. Honda Fort checked the car attaching it with HDS, cleaned the throttle body, told us that the IACV has been tampered with (the roadside mechanic did that).
They told us the better option will be to replace it (IACV) : The new one costs 12k, they also said an old one would cost us less than 2k...whichever we want to buy.
They temporarily fixed the old IACV until we find the new one, rechecked it with HDS, and the car is working flawlessly now.
And they charged minimum - lesser than the usual roadside mechanics.