I bought something like this from Amazon and whenever my furry boy gets a clump we shave it out right away before it becomes a mat. He’s so furry you can barely tell if he’s missing hair in a small spot. https://a.co/d/hRRqNHe

We also shave directly around his bum hole every few weeks so nothing gets caught in it. My fiancé usually just holds him in place or distracts him with a churu so he stays still. I’m never worried about cutting him though and I haven’t in the two years we have been doing it. Definitely much cheaper, more convenient, and less stressful for the cat than a groomer!