I did read it but then didn't do it.
I am building a sump in a 30g tank. I have the tools to cut acrylic, etc. So I thought great I can do it all my self.
But then I happened to call the local glass store and started asking about cutting glass pieces. The fellow told me to bring the tank in and he'll cut me the pieces while I wait there. I have to only then go back home and silicone them in place. I haven't done this yet, but that's what I'm planning.