This is probably the "Rolls Royce" solution and many owners and engineers will cut corners but the job has to be done correctly, but should be within most practical owners capabilities. If you are not sure get the local marine engineer to do it and watch.
Instead of the multi-tool you may be able to use a more simple drift - it depends how tight the cutless bearing is within the bracket. Additionally you will need to hire or borrow an hydraulic prop puller - great care needs to be taken in using these bits of kit - the prop will come off like a bullet - if you can the prop nut should be left loosely fastened to stop the prop falling etc (A prop repair or injury would be far more than getting a marine engineer to do this)
The actual bearing can be ordered from a Jeanneau Dealer or try Sillette Sonic