I weaned all my kids cold turkey. They LOVED nursing and it was a huge comfort for them but by the time they were 2, I was so ready to be done.
I didn't do mustard, or band aids, but I wore a sports bra and told them that nursing was all done. Theres no more milk and they were big enough for a cup now. That's it. Repeat 100x the first day but it was a ton less on day 2 and by day 3 it was over.