I fear it. :tin foil hat:
However, I know it works.
When you are feelin' sassy, here is how to go about it:
Monitor your temperatures and plant health during the week before you want to apply it.
Are the plants stressed at ALL? HAve your temps risen above 85'F even once?
If the answer to either is 'yes', you're not ready for it yet.
If the answer is no, you may apply it. Use NO MORE than the bottle says, and cut your background nutes down to 1/3 or less the strength you had previously been using.
Drop your room temps down to 75'F and never more than 80.
Raise your lights, or do what I do, whcih is kill the HIDs entirely and switch to backup lighting on the same timer/schedule. My backup lighting is a 24" t5 fixture in a 6x6x6 room. This also guarantees low temps.
Stay on this low temp-low light regime for 2-4 light cycles, then bring the lights back down to where they belong, or light them back up again if they were off.
Bring your nutrients back up slowly- go to 2/3 before you go full, and if you see even a HINT of yellowing leaves or a dull, lifeless lack of sheen on them that looks like heat stress, flsuh well and go back to partial lighting for another cycle or 2.
Personally I prefer to foliar feed it rather than liquid feed, as it does not stay in the soil and won't need to be flushed in case of emergency.
You can kill your crop with gravity. Take the instructions seriously!