Learning is like rowing upstream: not to advance is to drop back.
If one wants to create a great garden and then sustain it, there are really only two options.
Option 1: Start planting whatever appeals to you. As things fail, replace them with a different plant, another one that appeals to you. Keep doing this earnestly. Eventually, perhaps at the end of a very long life, you will have a great garden.
Option 2: Learn how to grow and sustain a great garden, especially from other experts (including those who chose Option 1 and who are very, very old). This learning might be in person, working alongside them or more often through their writings and other communications.
For those of you who prefer Option 1, thank you; you keep our nurseries busy. But for those who prefer the second approach, the next two weekends will offer some of the best learning opportunities of the year.