No worries at all, this is why we are here!

Some time back, I was new to this hobby, however, didn't have the luxury of the SOS website to help me with my endeavor. Start very small and advance as you succeed. I made my masts using a v-block (made by myself), plane, and sanding blocks. It is not hard at all, and I guaranteed it will be OK, without sweat and rubbing your bank account.
Here is a simple jig to taper the wood from one side using a plane or sanding block (depends on how much taper you need). You will turn the square stock as you taper each of the 4 sides. Just remember to take very small amounts of wood off with the plane, it takes time but it's the best way to proceed. It's also important that your plane is razor-sharp, and adjusted properly before you attempt to taper your mast.
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here some video
This one is my primer from all the time, It is made by great ship modeler master Mixail Bezverxnij (Dr, Mike), It is in Russian, but just watch and you will have an 'Aha' moment
Good luck! Let me know please if you need help.