Remove the bolt from the rifle. Next grasp the bolt firmly and hook the edge of the bolt (as seen in the following picture) onto something sturdy (I put a penny in a vice and pull against that). It will slide the firing pin assembly slightly out the rear of the bolt exposing a notch. While exposed insert a dime into this slot.
Now the rear of the bolt easily unscrews allowing you to disassemble the bolt.
If you want to disassemble the actual fireing pin and spring you have to use a punch and drive out a pin then unscrew everything. I'd recommend just cleaning the fireing pin with the spring attached (stick it in a jar filled with a cleaning solution then scrub it with a toothbrush). Spray it down with a good film lubricant and re-assemble.
Note: Clean the inside of your bolt handle with a wire brush / jag.