Reuse will be fine it's only the crown race that needs to be removed.
LBS should have the right tools but if you you're minded to do it yourself a hammer and punch is one relatively easy way to knock the crown race off the broken fork, not much that can go wrong there
Fitting crown race to a replacement fork is a bit more tricky - 1" plastic pipe or a 25mm-ish hole in a bit of wood can be used to knock the race into place (e.g. open jaws of vice or workmate to more than the steerer tube, sit the wood with hole bridging the gap, locate crown race, flip fork upsidedown with crown race against bit of wood and bash the underside of the crown with a hammer and another bit of wood)
check the gap between crown and race to ensure it's uniform all round and you're good to go!
Reuse will be fine it's only the crown race that needs to be removed.
LBS should have the right tools but if you you're minded to do it yourself a hammer and punch is one relatively easy way to knock the crown race off the broken fork, not much that can go wrong there
Fitting crown race to a replacement fork is a bit more tricky - 1" plastic pipe or a 25mm-ish hole in a bit of wood can be used to knock the race into place (e.g. open jaws of vice or workmate to more than the steerer tube, sit the wood with hole bridging the gap, locate crown race, flip fork upsidedown with crown race against bit of wood and bash the underside of the crown with a hammer and another bit of wood)
check the gap between crown and race to ensure it's uniform all round and you're good to go!