To dismantle you need something the support the hub but with a hole through the center to allow the axle to slide out when you bash the other end
First look for grub screws in the side of the end spacers-None ? Then place the hub one side down(front doesnt matter which side)
Taking a steel hammer and a little piece of wood to soften the blow with(although u can just use a steel hammer as long as you dont hit it too hart that it caused the end to deform)
Hitting the axle at one end with drive the opposite bearing and spacer out the hub in one go.The spacer on the side you hit will fall off or you can get a finger under it to pry is off the last millimeter.
I thin use another hole that the axle can slide through but not the axle or spacer to remove those. Place in hole and hit the other end till the bearing pushes off the spacer
Its all pretty self explanatory once you see the axle out
To get the last bearing out of the hub take the now bare axle and hammer it through the hub. The axle center will come up against the center of the bearing and drift it out.
Go and buy Hope bearings. Dont buy cheap copies although theyre fine i fine Hopes fit best and have the longevity
Fitting -
Take shell and place one of the bearings into the seat for it. You'll find about the first 1/2mm will go it and thats enough to hold it in place till you find the hammer that has somehow found its way into the toilet :?
Take hammer and TAP it is moving around the hub in a triangular pattern- A little TAP here, then there then there then back to here again till the bearing is 95% seated
Slide in the axle(DONT FORGET THIS)
Place the 2nd bearing on top and start to drift that side in too bracing the hub on the worktop. The other bearing will start to come out but be stopped by the worktop
To get them both fully in you need something to use as a drift like a flat screwdriver. and something that fits the diameter of the bearing but is smaller that the hub opening so it can slide the 1 mm in. A socket is good for this.
Just TAP and turn over. Once both are fully in put the spacers back on.The nature of the axle is it centers itself.
Reply when the front is done and we'll move onto the rear
ALSO
Unless you know the mechanic well ,dont allow a bike shoppe to actually work on your bike as ive never met such a cack handed brigade. Many of the mechanics only have experience of ultra modern and most times theyre sending it off to be sorted.
Any fool can do a jigsaw and thats all a bike build mostly is. Fixing complex forks and shocks 99% wont do themselves.
PS
What hubs are these specifically ? (too lazy to go back and look) Disc/non disc?