Sorry, but I disagree.
Its not possible to produce a true espresso with a pressurised basket. Period. They are useful for beginners and thats pretty much it. Get a real basket as soon as you possibly can Greg.
Pressurised baskets are produced to allow for the use of any old grind of pre-ground, stale supermarket coffee and they have nothing to do with espresso in my opinion. You will produce something black with false suds (aka crema) on top and thats it. Its not what I call coffee.
While we are all on a journey, Id argue that you will learn little, if anything at all until you start grinding fresh with a real basket.
Best bet is to get out there and taste coffee made by a true expert. Most cafe coffee is poor to average. The great baristi take us to a whole new level and understanding of what coffee is about.