I have spent the overwhelming majority of my handgun trigger time with TDA firearms, first the M9, and then SIG 226/9s of various flavors.
My agency is going to be transitioning from the P229 to the Glock 19M in the relatively near future. I have no hate and discontent towards the Glock, but I have made a conscious effort to concentrate on one platform at a time for both work and gaming. As a result, I have almost no experience shooting Glock platform guns (probably less than 150 lifetime rounds).
From my limited experience with Glocks I know that I will need to learn a dramatically different index, and that the lack of an under-thumb slide release is going to drive me nuts for a while.
What are the things that Glock shooters wish they had been told when starting out?
Without being able to install a gadget, how do you mitigate the lack of hammer control when holstering?
I am not a completely inexperienced shooter (pretty consistently mid C in USPSA production class), but this is almost completely new territory for me.