You don't say which model DW you have (357 Ctg means a .357 Magnum chambering), so this may, or may not be helpful.
The actual removal & installation is simple, but you do run a risk of misaligning the crane by torquing accidentally while doing this with the crane in the frame.
If you have a "Porkchop" barrel shroud I'd suggest removing the crane from the frame, attach the parts & reinsert the complete repair to the frame. If you have a 15-2 without the porkchop its a tad harder, but I'd try it anyway just to be safe.