hi, the bead breaking bit is the dificult bit. if you are in a group simply use a sidestand and the weight of another bike to push the bead into the rim well. if on your own it's a bit harder, i used to stamp on the lever when it's in the appropiate position and move it along until it's tyre is free.
i guess you will need to practice in the comfort of your own space to find out how to do it as it's one more skill you never want use but a huge help if you need to

j beat me to it!