Dead easy.....

Pull the bearing holder and rubber off the prop and you'll leave the bearing behind on the spline of the prop....

Plenty WD40 and I tapped mine off with a hammer (working around it) as the legs on my puller weren't long enough.

Clean the WD40 off and put a thin smear of grease on the spline and slide the new one in place and refit bearing holder with the rubber....

QH do the rubber for £3.42, I got the bearing from Burtons