My advice is to start drinking heavily.
You won't have to wait until spring 2022 to use your trumpet if you take learning to use it seriously.
There is plenty of time to be ready for this spring if you practice daily, use the same discipline you would for any musical instrument.
If you have the ability to use a trumpet at all you'll be good enough by spring to call gobblers.
Some of the best advice I've heard on getting started came from Billy Buice, and that was play it daily 10-15 minutes while your mouth is getting used to it. Don't practice 2 hrs. one day and skip several days.
Use the lanyard, drive around with it and learn to play it one handed, which you will need to learn anyway.
watch the u-tubes mentioned, add Del Crow (savduck) on here to the list if not already mentioned. as you progress and rewatch them you'll understand stuff that went over your head in the beginning.
Also your first season it doesn't hurt to pray for gobblers that rode the short bus when they were growing up