If you take the time to look through the forum you will find a lot of informations, it's a bit sparse here and there, but the amount of knowledge stored in this forum is absolutely incredible, almost overwhelming (in a good way)...
it's also very likely that someone else has already built the model you have in mind for your project; that could give you some sort indicative direction or ideas.
On top of that, here in the forum there are a lot of very skilled, experienced, and very generous people that can provide amazing advice if you have a question, or if you have a doubt on how to proceed, or if you need clarification on what should be the next step in built.
About the soldering skills specifically, like anything else, it's something that can be learnt and picked up. Great to hear that you are picking up your soldering kit today!! That's the way! DIY!
You can consider practising soldering loose wires at the beginning, just for the sake of it for learning how it all behaves, before attempting soldering the electronics in your guitar. As you already pointed out, tons of videos online these days with tutorials made by very generous people, otherwise ask here, or give a call to a friend that could be familiar with soldering or with any other toll you feel comfortable putting your hands on.
Building a guitar from a kit is definitely doable... there might be some occasional hiccups or speed bumps here and there, but it's all part of the journey... and it's a very rewarding experience... the journey itself as well as the finished instrument!
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