If you get a very warm cloth & place it over the injection site bro it helps ALOT, then every 5 mins just massage it for a while. This will help you for now.
My last injection I missed judged it & pretty much injected really close to my outer head bicep instead of my shoulder, lol. That fuckin hurt like a mother fucker, I was too busy watching Prison break, when I aspirated I realised I put the pin in too low, so I thought fuck it but boy that's gonna hurt tomorrow, looooooooool...
As for heating up the solution. You just pre-heat the oven at 275 bro, don't leave it on & put the gear in lol. I made that mistake once but fortunately I checked it every so often & nothing melted. I know for next time to just pre-heat the oven, then when it's hot enough, turn it off & put your gear in for just over an hour but don't forget to put a pin in the top & make sure it doesn't touch the solution

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Currently 261lbs 12.3% bf - Diet's been touch & go for several weeks
Squat : 600lbs X8
Deadlift : 573lbs X8
Bench : 530lbs X1 (Raw, SMITH)