I haven't done this in years. However, I used to do it all the time. It gives a lot of fexibility in roll size. It isn't hard at all, just something to be learned. As mentioned, you need a bulk film holder, and some cartridges. I used to keep my Fuji film cartridges when I developed them, but I don't know if any commercial film can be used that way any more. They can be bought. You do have to keep the bulk film holder and cartridges clean. Some people report problems with scratching due to dust getting in one or the other. It can happen although I was fortunate enough never to have that problem.
Others who have done it more recently can probably give you advice on what are the best of the currently available loaders and cartridges, as well as keeping things clean. If you do get started, I think you will like it.