Primary Pump Replacement

Good morning all, I hope you're well.

I'm hoping for some advice. I've recently had a new flow switch installed in my boiler which is attached to a BoilerMate A Class, both installed in 2007. Unfortunately, the primary pump has stopped working and needs replacing, so I was wondering if this is a straightforward job and can be done myself rather than paying someone to do it?

Thanks in advance for any assistance!