I don't know about you, but I've never had much luck using DIY water slide decals that I print on my inkjet printer. The printing usually washes off. Once I cut out the decals to fit an n scale item, they become too small for my fat fingers to handle. It never goes well!
I came across this video by Bare Metal HW and found it very interesting. I haven't tried it out yet, but I plan on trying it out. It looks much more user friendly to me. If it works, it will definitely be much cheaper than wasting decal paper through many failed application attempts!
Check it out and see what you think!