Welcome to TNUK, Wills.
Like you I was stuck in a job I didn’t like for 19 years.
Escaped 5 years ago and did a few mundane things before getting class 2 in Dec 04, then class 1 Aug 05.
Don’t know if it’s just because it is still new, but I love the driving! (but then I always did love driving cars and bikes long before i thought about HGV).
Maybe I have been lucky to get the job I have just now, which is driving Glasgow to Aberdeen and back (still not bored with the scenery after 6 months) every day. 4 days on/ 4off. No hassles, decent motors. Suits me down to the ground. So I would say to anyone thinking about it, go for it!
Al.