May I suggest that instead of focusing on the blocks that you are comfortable with, perhaps searching for ways to complete the blocks that you struggle with? Clearly you chose this pattern because you like it, wouldn't it be wonderful to complete all of it and at the same time gain the skills to make those tricky blocks??
Check our guilds in your area, YouTube video's, quilt retreats, professional classes that either focus on these skill sets or are willing/able to accommodate lessons in the areas you need (there are lots of classes for paper piecing).
If you are not interested in joining a guild, be sure to ask them if they have classes coming up that would cover your topics that you could attend ... or even if they have a member who lives in your area that would be willing to do a one-on-one training session??
It can take a while to build new skill sets, finicky Y seams require patience and accuracy and paper piecing isn't immediately mastered by a lot of people (I found it's easier to learn PP by using true solids or batiks where it doesn't make a difference which side of the fabric you are using!). But once you've learned the skill ... like riding a bike ... you won't forget it and will soon be choosing other quilts that require those skills.