Need advice on 48" mower bearings

I understand the spindle bearings on this deck are sealed units , I have a new to me 1974 140h3 with a 48" deck, while the deck seems to be still working , I not so sure if the bearings are as quiet as they are supposed to be or should be , while there is no squealing or grinding noises but seem to be a rumbling noise while mowing , when I turn the spindles by hand they feel lumpy , I m planning on replacing all the bearings and or the idler pulley if they need it this Winter or in the Spring and wonder if I can do the spindles myself with a sledge and sockets and wooden blocks etc. or if I should remove just the spindle assembles or simply take the entire deck to either a mower shop of which I have two independent dealers near by or pay the bigger bucks and go a bit further down the road to the JD dealer .

I don't have access to an arbor or hydraulic press or have a HD steel vice at home .