Locate a place on the wall, near a seam, where there are no studs. Strike the wall with your hammer and punch a hole in the drywall shell. Work your crowbar around the perimeter of the drywall panel, prying it off the studs as you go. Remove all of the drywall sheet, then move on the next one in the same manner, until one whole side of wall covering has been removed.
Use your small sledge hammer, held so the head is sideways, to break away the drywall sheets on the other side of the wall. Strike each drywall panel from the inside, along the seams where it meets the wall studs. The drywall will break off and fall away with minimal effort.
Use your screw gun or hammer claw to remove any nails or drywall screws which are sticking out of the wooden wall framework once the drywall sheets have been removed. Turn off your circuit breakers, and water supply cutoff valves, and remove any power lines or plumbing from the wooden framework. Use a reciprocating saw to make cuts in the studs so that the lines can be slipped out of place.
Use your circular saw to cut the studs in your wall framework around the center point. Make diagonal cuts to ease removal, and use your crowbar to rip the stud anchors away from the top and bottom plates. Continue in this manner until all the studs and corner braces have been removed.
Use your crowbar to remove the top and bottom plates from your ceiling joists and flooring surface. Use your hammer claw, or the back end of your crowbar to take out any remaining nails.