I just got the ZAGG screen protector from my cousin like about a week ago. I actually had the one with a sticky side and the ZAGG which needs to be sprayed entirely. Be careful when applying the ZAGG because if the liquid gets into the holes it will make your iPad/devices stop working. I got lucky because I prayed about it and it actually ended up working after like a few days or so. So just prevent the liquid from going into your power button, home button, earbuds hole, etc. Jesus Christ! I tried so many things from putting it in rice for a while to blow drying it on low to see if it would work. Do not expect immediate results. It takes some time for the water to evaporate especially since the area where it leaked into traps it.
Anyways, I reused the ZAGG screen protector and it still works fine. I would not really like to re-apply it again. However, if you are scared then a professional install is good. Make sure they have a guarantee that if the equipment does not work you get another one or at least repaired free.
The bubbles that are left over after will work itself out through the tiny pores in a few days. I still have like a handful, however, that is it.
There is a tacky feel. However, it is supposed to be really scratch resistant. I would still treat it like a fragile device needing love.