Shwmae Gary,
One thing you could do is list all the words that you feel will be relevant to you, ie; what youre likely to use. Start small, keep adding as you go along, and once you’ve learned the word, cross it out!
It’s a method called “The Gold list”, (or at least a morphed form of one). One thing I would suggest is avoid link words for your list if you’re following the SSiW course, as you will most likely learn these link words through the course using the proven SSiW method. Then, you just refer to that list now and again and refresh your memory. Once you feel you are familiar enough with that word, scribble it out! That way, you concentrate more on the words that you want to know and know you will use, and less with the words you either already know or will never use. This is just a method I’ve used for vocabulary that isn’t covered in the SSiW course (Very useful vocabulary is learned here, but the focus is more on getting you speaking conversational Welsh quickly, and to help you be able to hold down a conversation. After all, it’s when you’re speaking Welsh in conversation where you will learn a LOT more vocabulary from the person or people you chat with).
As for vocabulary about feelings, there is a lesson covering feelings after Course 2 in the Vocabulary units (if you’re following the old course). It is advisable to follow each lesson in lesson order so you are familiar with other link words that will be introduced on the way).
But certainly, the gold list does help. I can’t actually remember where it came from, only I learned about it through this forum. There may still be a thread about the original gold list and who originally came up with the idea, if you want to search it and read for yourself, and use it how it can work for you.