I agree that if the thing is seized you'd best be careful.
I surely couldn't tell you since you don't mention what brand, what model, which bearing (bearing that drive the main mixer, a bearing in the motor, tub pivot bearings..... or provide a pic or much other info.
My mixer is a different brand and configuration.
You might also consider checking if it could just be a dry bearing; oil grease, possibly heat the area with a heat gun since sometimes zerks dry out, won't accept grease. You might also try to loosen the belt/ drive and see if you can reverse the direction and break it loose.
My old mixer had frozen from years of unuse. I replaced the zerk, heated up the grease, pumped in some fresh and worked it back and forth until the electric motor could finish the job.
If yours has been run dry you might be able to relube it and use it this week conceivably without tearing it down.
If it is a destroyed bearing you'll likely have to tear it down. If parts are not available sometimes good machine supply houses can cross reference bearings and provide you equal or better replacements the same day, off of their shelves.
good luck.
Willy