Anyone can shoot an IR, but the difference between a bad IR, a good IR, and a great IR comes down to the room it’s captured in, the mic chosen, mic placement, quality of mic pre, quality of conversion, and quality in capturing method. So there are a lot of variables that come into play for the end result.
I think you should try to shoot your own IR. You’ll either love it and find it familiar since it’s your own cab, or you’ll have a greater appreciation for what 3rd party IR makers do. Either way, it’s a great learning experience.