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To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.
after installing new thermostat do i need to bleed the system out after toping off the antifreeze?
Yes you do. Here's an easy way to do it.
I always just leave the expansion tank cap loose, after filling, (about 1/4 turn) and go for a short warm-up ride. Let it cool and, if needed, add coolant to the "full cold" mark. Afterwords, put the cap back on tightly.