To change the air mass meter is very easy. Your thermostat is a bit harder but if you think you can do it, its very easy.
Tell the dealer that yoru buy the part out from them and install it yourself and let them do the thermostat.
I forget exacatly what it looks like in your car but eather they give you the whole cylinder with the sensor inside or the give you the sensor, two T25 torx hold it in place.