when you switch on your Tea II give it 20-30mins to get brew group up to a stable temperature, sometimes the gauges aren't very accurate. As far as 'pressurising' goes the machine builds up boiler pressure as it heats up and when you use water the boiler it will top itself up.
Give the machine some cleaning flushes with a blind basket in your portatiler at the end of each brewing day to keep screen and group area clean and a chemical flush occasionally to clean up the buildup of oils inside the group.
When you steam milk always purge the wand before and after steaming and wipe the wand immediately after steaming to remove milk from the wand.
Once you get accustomed to your new machine you should be pulling some great shots and pouring lovely textured milk--enjoy........................