For newbies watching this, once you learn the basic safety tips, it becomes very easy. Here are some thoughts on the techniques shown. As Dan noted, locking in a cool portafilter isn't always a requirement, nor in my experience is cocking the lever before locking in the portafilter. If you add a Teflon gasket between the group and boiler the machine becomes more temperature stable. Heat break gaskets are standard issue these days in Olympia Express Cremina and Ponte Vecchio Export home levers. Also the boiler size in the Microcasa is large compared to most other home levers. I can easily serve espressos and steam milk for four people. Then I let the machine cool while we're eating breakfast or use something like Tom's technique to release pressure and refill. If you're going to use the Fellini technique of multiple pumps for more volume, you can increase the dose of coffee for a higher brew ratio, coarsening the grind to maintain a steady flow rate.
What I WOULD do for a good cup of coffee!