Yamaha 50 swivel bearings

[Stubber]

Hi, am wondering how easy/hard it is to change the swivel bearings on 3 cylinder Yam 50 triple cylinder engine, what the procedure is and is there any specific/special tools to use in doing this work, its a manual tilt engine in reasonable condition for its age and just needs a tidy up on the paintwork in places.
The play in the bearings seem a little over excessive but still moves freely.

Any help appreciated, thanks