I think you should try the pillow again....here are a few tips.
Use a Lifeline when you get to the half-point and then at the end of your pattern repeat. THAT way, if something does happen, you wont have to rip out the whole thing. There is a how-to video on this page under "fixing mistakes". Usually, you would use a lifeline only at the end of a pattern repeat, but 25 rows is a pretty long repeat. I wouldnt want to pull out 25 rows!
USE your mistakes to learn more about the anatomy of a st. I had an AHA moment when I learned to fix mistakes...I think that felt better to me that learning to knit in the first place! All of those videos on the page above will help.
You said you know how to K, P, CO and BO. That's ALL you need! Everything you do from here on out will be a variation of those things. Use the abbreviations tab if you see a new symbol you dont know...all of the videos are linked to their abbreviations.
What pattern are you making? We can help!