Although Lightroom is by far my favorite photo editing tool, I have to admit that it has quite a few shortcomings that take some effort to overcome.
Normally, when you start learning multiple computer programs, the process becomes easier and faster with every new program you learn because most share common features and concepts.
Previous experiences, however, do not always help us navigate and understand Lightroom because it is quite a unique program. Compared to Photoshop, I do not consider Lightroom to be a very complex application to learn; but, it takes time to understand its unique logic and the various concepts behind it.
It all starts with a user interface which, I find, can be confusing at times. The unique user interface is typically the first stumbling block for most newcomers.
Let me explain