I agree 100%, Brian send very detail instruction's. Down to the torque setting if using a drill, like I had too for changing the amp on of my FV18.They'll send you instructions. It's easy. Only 10 screws and some slide on connectors. No special tools.
It just takes a lot of careful prying to get the amp to come loose from the sub box because it's in there tight (which you want it to be tight) and there's a gasket too.
And on the FV18 (nice and heavy), the woofer also need to be remove before changing the amps. And using two proper size Allen key. With the short end in two opposite hole and using the long end as the handle, made it a walk in the park.
I'll take a lot at. Hopefully I have everything I need and won't have an issue taking the amp out.
You should have no problem at all, and if having problem lifting-it. If so use a couple proper size Allen key, as I did on the above quote for my FV18 woofer. If you don't have any, it would be a small investment for not damaging the cabinet by using a small flat screwdriver.
If torqueing the screws back on by hand, the trick is to stop when they feel thigh and not overdoing it. And another thing is with 10 screws, you work at opposite patterns like so;
-first one, top left corner
-second one, bottom right corner
-third one, top right corner
-fourth one, bottom left corner...
Something like this;
1, 7, 3
4, 8, 2