Beginner Question Sub Mounting

I know this may sound stupid but I have to ask.  I have some rockford fosgate T1 15D4s coming in tomorrow and I wanted to know how to mount them without  puncturing the sub by mistake. I installed 2 other subs about a month ago and winded up puncturing the surround.  Would a screw guide help in installing the subs? The subs are going into a big enclosure that can't be removed from the truck. So laying them down and mounting them isnt an option. Any help would be greatly appreciated. thanks.

Drill proper pilot holes for the screws, never try to use self-tapping or wood screws without pilot holes.  Use T-nuts and lag bolts if you can.  Use sticky rubber sealing compound to "glue" the subs in place, don't try to hold them in place with the screws.  Use the screws simply to secure the driver down.  Don't use a power screwdriver that can get away from you like a high-speed drill.  Cover the sub with something hard like a piece of fiber board of MDF when you get near it with the screwdriver.

Or better yet, just go slow and be careful. 

What's wrong with venting your subs, I always thought it sounded better.

I call it dum-dum, you can find it on the tips of almost all my tools that screw (screw drivers, allen wrenches, etc) things in, works great in tight locations.

Hey, that's a good tip!  I've got bunches of sealing caulk and never thought of using it that way..........

is there any store that  i can get the t nuts and sealing caulk other than online?