I think I can handle that. Does it matter in what order you pair the devices?
From a purely technical point of view, no, the order of pairing does not matter.
But, because you are new to the whole process, you might find it less confusing to first pair your helmet (the microphone & speakers, which comprises the "headset"), then once you have done that, put the helmet on (in your office or kitchen or wherever you are) and then pair the phone. This will enable you to listen to the system through the headset as you complete the process. Once you have paired the phone, you can then practice using it by having someone else in the house call your cell phone (you then see the notification on the GPS screen, and elect to answer it), and you can practice in the other direction by placing calls from the GPS/phone/headset to someone else in the house. This will also enable you to adjust volume on the headset, etc. so you get everything right before you go riding.
For what it's worth, though: You might want to think twice about actually answering (accepting) calls while you are riding. Even though I have 20+ years of experience riding with a GPS paired to a headset & phone (I used to beta-test for Garmin), and 40+ years of working as an aircraft pilot where I was always using a headset to talk with ATC, the other pilot, etc. while having to operate the plane at the same time, I have found that talking on the phone while riding a motorcycle is
extremely distracting and really compromises my ability to pay full attention to the road & other traffic.
I don't make outgoing calls when I am riding the bike - ever. If I need to make an outgoing call, I pull over into a safe parking area and make it when I am stopped. I also don't answer calls when I am riding the bike. I look at the screen and see who is calling (this will be displayed if the caller is in the contact list of my phone) and I ignore the incoming call - I don't answer it. If I think that I really need to talk to whoever is calling, I pull over into a parking area and phone them back a few minutes later.
Michael
PS: Be aware that once you have paired the GPS with a headset, you lose the ability to control volume of the phone, music, and GPS guidance prompts via the GPS screen. You can only control volume via the volume control on the headset. Some - but not all - GPS devices will still allow you to adjust relative volume of different sources via the GPS screen (e.g. music at 60%, routing guidance at 100%, phone at 80%).