Its not fiddly but it takes a long time, you have to leave it ages and do lots of rinsing, you cant skip or shorten or it wont work...well worth it though
Mine had LOADS of very dark colour on and it stripped it all out
If you want to leave it as it is then you can, or putanother colour on
It shouldnt go orange - it doesnt bleache or lighten your hair, it removes the dye pigments