ississauga said:

Can oak stair rails and spindles be removed?, are these screwed in?
Any tips/tricks on removing them without damaging them since they need
to be put back.

If they are built so the spindles must be cut at the treads to remove
them, what technique to use to reattach them?

Dude, you need to go to the local library and get a few books on home
improvement and general carpentry and woodworking. ;-)

But to answer your question as best as I can, some balusters are glued
in, some are simply pressed in, some have nails driven crosswise into
the ends where they enter the banister and stair treads.

Anyway you look at it, it going to be a PITA job! I would pick the
least exposed spindle (so that any damage is more easily concealed)
and look for small nails or other fasteners. If I found none, I would
attempt to pull the joint apart. If it breaks and/or you see the
remnants of glue, you're in trouble! You could try gently heating the
joints in an attempt to soften the glue, or try a solvent, but either
way, it going to be a PITA. If the joint comes apart easily, you're
in luck, they are just pressed together. Good Luck!

FWIW,

Greg G.