evacuate the A/C first from the valves behind the right rear passenger side vent (in the engine compartment), this should be done by your local shop to capture the refrigerant and prevent venting to the atmosphere.
Once done, you can safely remove all of the A/C lines and canister (#1 in your pic) plus all of the ducting, wiring and coolant hoses need to be removed and/or pinned out of the way. If you pin back the coolant hoses up and out of the way, there is just enough room and there is very little coolant lost so you shouldn't need to drain the coolant. The hoses are usually tough to remove because they "stick" to the fittings on the heater assembly- I found using a blow dryer to heat up the ends of the hoses helped a lot.
The heater assembly (#2 in your pic) and the blower need to be removed as one unit and then can be seperated once out so it gives you a good sense of how much needs to be removed to make room.
There are a number of posts and pics detailing removal on here, so keep searching... if you get stuck post again or pm me.