There are about 8-10 screws that mainly hold the dashboard, I cant really remember coz the last time i did it was almost 3 years ago.
This is how i did it. You look at the mitsu dashboard and find out how many brackets that can be joined to the body, It will be a direct blueprint with the wira's one. Remember, always remove the screws from inside then move outside(center towards left and right) and do the reverse when screw it on.
Yes you can use the same blower.