its a simple job bro.
i've done it in my alto
You have to buy two different thicknesses of Jumbolon (for heat insulation)
10mm for the floor, and 5mm (or a bit less) for the doors and roof (since the thicker the jumbolon the harder it is to manage). U can get it from any carpet shop mostly all the carpet shops have this item.
secondly, if u plan to do the roof of ur car too, i suggest k when u remove the roof lining etc, and Stick the jumbolon (make sure u use a good sticking agent, i used cementex) , then Leave the Insulation there without Putting up the roof lining for a day or two, so that wo araam se sookh jae and u can attend to any places that are loose, and Be sure to take out any bubbles when the sticking solution is still wet
the major part in this job is too Strip down the interrior properly, without damaging anything, and also before sticking it the insulation to the floor , Make sure to Wash the floor (if there are no open wires and stuff on ur car's flooring) or atlesat wipe it with a wet cloth so its free from all Dust particles and stuff like that.
And at the last, please do post pictures of the job