In order to safely remove the bolt, MAKE SURE THE FIREARM IS UNLOADED. Once that is determined, put the gun in the fire position, pull back on the trigger, and press down on the sear at the same time. You can then remove the bolt assembly from the receiver.
The article below has detailed instructions.
https://savagearms.com/blog?p=how-to-remove-the-bolt-in-centerfire-thumb-sear-release