I threaded my 0.591" barrel using a .223 tat, cheap chinese die and lots of oil. The hardest part was getting it started. Although I wouldn't recommend it if you have other machine tools, it can be done at home. Currently the rifle has a 14mm x 1 L to 24mm x 1 R adapter and an AK-74 brake.
Another thing I considered when starting this project was to turn down the very end of the barrel to allow the die to get started easier.