Working with these receivers is similar to constructing a building. Start building the foundation with simple tasks requiring only a few steps. After you get familiar with these, you can move on to features of the unit, but only one at a time. When you have the basic tasks mastered, decide what features you will reasonably need to perform on a regular basis. Practice and master these. If the scanner starts to get to you, put it down for a while. When you go back to it, what you thought you did not know will be crystal clear.
There are features on my units that I rarely or never use. If I feel the need to, the instruction manual can be used. Try to be patient. The skills will come to you and you will wonder how you got them. Remember, only one step at a time.