Pattern instructions definitely assume you already have a clue about sewing! To be honest, when I started sewing for dolls I had to relearn all my old sewing knowledge because it had been so long. I ended up getting a basic "sewing for dummies" book. Even though it is geared towards machine sewing, it's an invaluable source for basic knowledge AND it does explain how to read a pattern hahahahaha
And one thing I found is if I read through the instructions and feel utterly confused - once I start actually sewing things together WHILE reading them it starts to make more sense