I find it hard to believe that you are not able find a good installer in Mumbai.
Its a different matter if you want to Do it yourself.
By wall of the boot you mean the side wall right ?
There have been numerous posts on as to how to tune you system.
Ideally you should set the gains on amps in such a manner that they are niethr over powering the comps\sub nor under powering them, also may have to set HPF & LPF on amp if available. once this is done you can do remaining settings from the HU.
I am sure some one can word it better than me
