I'm an exclusively pumping mum.. and I am trying to wean my supply.. how do I proceed to do so?

One of my friends did that by increasing the amount of time between pumps. She was pumping once every 3 hours. So she changed to once every 3.5 hours (she tried 4 hours first but felt engorged). Gradually, increased to 4 hours etc. That led to dropping one pump session and another and ultimately, weaning from pumping.