The job on a Swede is complicated by the cutout in the root of the handle for the bolt sleeve. Personally I think that a better job is achieved when a replacement handle is fitted. The stump has to be correctly prepared, the handle fitted, and jigged in place for the welding, which must be done skillfully. I have done a fair number of bolt alterations. I do not think that I would do only the installation and welding, leaving the rest for someone else. There are other issues involved in doing a good finished job than just the cutting and welding. Incidentally, if you saw the bolt just after the welding was done, you might really ask yourself, "What have I gone and done to this bolt?" It isn't pretty.
Unless you want to learn how to do a conversion, as a project, for the sake of doing it yourself, it is probably best to have the job done by someone who can do a first class job.