You really do not have to go to a professional for this...unless you are planning a super-exclusive dedicated HT room...even there you don't have to go to a pro for the things you have listed.
Just go through this and other forums to get the basics of HT setup, youtube has plenty of videos to help. Get a good electrician to lay your cables in case you need to run them long and across the room. Get a decent speaker cable from what is available in HTStore.in or HiFiMart.com...MX or Belden from SP road would do good too. 14 or 16 AWG is good enough for a typical HT setup. If you need to run long cables (30-40 ft) for surround, you may need 12 AWG. Just ensure you do not run speaker cables through the same conduit as your electrical wires as this would result in interference and degrade the sound. If they need to cross each other, do it at right angles if possible. Get a good electrician to install the PJ and screen. Your AVR would do your audio calibration, assuming it has Audessey or YPAO or ARC or something similar. These are generally good enough for a typical HT. For video calibration you would get plenty of resources on the net that lets you do it. AVS Forums has a good calibration module that you can download. Monster comes with a ISF calibration disc that is super easy to use. In fact watch a few of your favorite movies and you'd be able to figure out the picture setting that you like.
Half the fun of an HT setup is setting it up yourself. The other half is divided into showing off and watching movies