Gemmainthesun - I didn't have puregon or menopur, hopefully someone will come along who did. Looking online, they both appear to be stims - I just had one stim drug, Gonal F, which is similar to your Puregon. The way my protocol worked, I started with the stim drug, which makes the follicles grow, injecting daily from day 3. So I would think you will start with the puregon and menopur.
The cetrotide is to hold back ovulation while the follicles grow, so you hopefully get lots of eggs. So they normally monitor you and when you get anywhere near ovulation, they tell you to start cetrotide to hold it off while you stimulate some more. So at this point you'd normally be taking your stims AND the cetrotide.
When you get to the point where they are ready to go to egg collection, they will tell you to trigger. None of your three drugs are the trigger, they must be planning to give you it later. You won't need it until 36 hours before egg collection, so don't worry. The trigger shot contains the hormone HCG - mine was called Ovidrel. This is the last injection.
The instructions for Menopur says it can be kept at room temp or in the fridge. Room temp for drugs usually means about 20 degrees C, so I think you're wise to keep it in the fridge in a hot climate. I kept my Gonal F in the fridge once the pen was opened, even in the UK.
Was
this where you saw the demo? What are you confused about? I haven't watched the demo, but i can and explain anything you're not sure about (I'm a nurse and deal with injections of lots of different drugs).
Let me know if I can help at all. It must be really daunting to have to learn a new skill like this without being taught in your native language! xx