take to a reliable shop if you know of one, if not then ask the dealership to do it.
by my own experience of changing evaporator coils of old mercedes W140 (evap coil as big as mitsubishi 1 ton split) and other odd cars in my life, take a spray bottle of water and mist all plastic panels that need to pop off, do it 6 or 7 hours before the job. Buy some blue threadlocker too and give to mechanic (including dealership) to use on the dashboard corner bolts, it prevents them from rattling loose over time.
Ask mechanic to wrap the H block expansion valve in cork tape too - no ifs or buts, just do it.
