I had someone wait at KBD for numerous hours because they saw me training prayer at the altar near there. Eventually they timed it right and caught me, this was like the second time I attempted a HCIM. So it was a pretty sad moment for me lol.
I agree with @Rowy completely. Training combat through slayer is the best way to go, especially if you enjoy pvming, once you start doing boss tasks you’ll become like a lot of us and fall in love with pvm in general. I have a few certain bosses I enjoy doing just for fun as well, so you’ll probably find a few you enjoy doing along the way! Best of luck!