The slate call is easy to learn,I use the mouth call a 2 reed version to free my hands up when they are coming in close. They are not that hard to use for the basic yelp and cluck,the purr is the hardest one I have learned how to do with the mouth calls. Start practicing now and you will get it down in no time. Also I learned a lot by watching hunters on Youtube and hunting shows,this helped me to know when and how to use certain calls. Good Hunting.