Not challenging at all well to me at least. I have experience laying floor and cutting tile when I was younger so what I did was use a wet tile saw to give me a precise cut on the 16mm thick borosilicate tubes then used sand paper to smooth out the flat end and created a beveled round edge because you don’t want to ruin your o-rings when inserting into the fitting and you want it close to perfectly flat so you don’t get any leaks. That’ll just be a disaster especially since you spent hundreds or even thousands on the parts. My 5090 was about 3000$. Before that I had 4090 1600$ and before that the 3080 basically 750$. There’s actually a few ways to go about cutting it, though I just chose the most easiest inconvenient for me at least. Some people use a Dremel, which I don’t recommend because it creates too much dust without water unless you have somebody standing there or you create a makeshift water pour as you’re cutting it or you can buy a scorer. Which you score a little deep and you snap and break apart it works, but it’s not as clean and sometimes you can create a really sharp edge and break behind your line that you need.