This is a very familiar story for modelers. I think we all strive to learn the things we don't know and improve the skills we do have. That sometimes comes at a price, frustration. I would venture to say EVERY modeler, even the masters, has become frustrated at least once on EVERY model project. I have experienced countless times I've made the same piece/component more than 3 times. With each new version is better, but costs so many "frustration points". I think "how" a modeler works through this frustration largely depends on their personality and experience.
There are a few options.
Option 1: (recommended)
Uwek's suggestion. Share the challenge your currently faced with. There is an incredible amount of knowledge amongst the members of this site. They are very happy to help!
Option 2: (not recommended for fist time builders)
If you feel the need to pause your work, do so. But I would offer a small warning. Starting another model could actually add to frustrations. Keep in mind you will now have 2 sets of wood, small intricate parts, all needing to be kept separate and organized. Also, keep in mind, as stated, "
EVERY modeler, even the masters, has become frustrated at least once on EVERY model project.", it is just a matter of time when you run into that little or big challenge on the new model where you have to once again work through it. Hmm which option will you choose?
Option 3: (viable)
Pause your work on the area you're having difficulty with. Instead of starting a new project, focus on another element of your ship that can be done independently. Perhaps guns and carriages. Maybe you can prepare the masts and yards ahead of time and store away. This is what I do. Sometimes while doing these other things I have an epiphany on how I can solve the original problem. Personally, I know starting another model will most likely cause me more frustration. I am currently working on three areas of my current model project simultaneously. Not my default mode, but my "frustration management mode".
I really enjoy problem solving, always have. At 67, it helps exercise my mind and keep me mentally sharp. Well, I guess "mentally sharp" is a relative term. Let's say sharper than if I didn't model.

There is this old saying; "the harder the squeeze, the sweeter the juice". Which I truly believe and experience often. The more difficult the challenge, the more rewarding the feeling of accomplishment is once I've worked through it. Hence, I attempt to work though things on my own. I do request help when I've become completely stumped. But before that, I attempt to research, google, read anything I can to find the answer I am currently seeking. This certainly slows my progress down. But, I'm not building a model ship for a sales order with a deadline. I do it for myself.
I hope this long post helps is some way. Don't let the frustration sour you to the hobby. Post, share your issue. I can guarantee there will be many folks that have experienced the very challenge you're facing and you will most likely receive more than one possible solution that they found worked.
Cheers,
Ken