Gabriel:
It is a snap, de-installing my old mass airflow sensor and replacing the new one took me maybe 20 minutes. If you are all thumbs and not at all mechanically inclined it may take an half hour; maybe an hour. It's not a complex procedure.
I suggest you go to
http://www.geocities.com/kuleshoff/MAF.htm and review the SVX instructions prior to your install.
Good luck.
Ken