Go back and look for the fork. It will probably be chrome to match the rear end and it will be straight leg, tange dropouts and threaded steerer. Might have fender mounts on the rear of the dropouts as well.
Crazy paint job on that sucker. Brake levers and calipers are the right ones too!
can I go to a Machining shop and do it or need special something?
You'll need to remove a circlip on each side where you can see the bearings. Then just give the spindle a few good whacks with a hammer. The spindle and 1 bearing should pop out. Then use a dowel or something similar inserted through the BB shell to knock out the other bearing.
Frame (XEC191022) bought new when I lived in Canada - upgraded locally (Gripsports in Melbourne) 3 years ago:
rear triangle rechromed & disc brake mount added
cable guides rerouted (got rid of that pesky front derailleur pulley)
original Yeti fork repainted, disc brake mount added
bottom bracket thread glued in to accept "modern" cranks
new decals based on original designs
Still rides like a dream! (pic available on request:vertles52 @ bigpond.com)