I've never had a problem. The system will self bleed. Add fluid slowly and when the expansion tank is near full bounce the car up and down a few times. That might drop the level so repeat until the tank won't accept any more fluid.

Start then engine, hold revs at 1500. and with the cap off wait for the thermostat to open. When it does the level in the expansion tank will drop, so add fluid as required.

Put the cap on and go for a short low speed drive. Then check and correct level as necessary, and do this for the next few cold-hot-cold cycles.

System capacity is about 12 quarts, so I fill with 6 quarts of Zerex G-05 and finish off with distilled water.

Duke