Paper piecing is a completely different method from rotary cutting & piecing so even if you're still working on that perfect 1/4" seam--paper piecing won't interfere with that practice. You follow a line when you sew while paper piecing--not an imaginary or mythical (in some cases) 1/4". An actual honest to goodness sew right down this line! And it's even numbered for you so you know which piece to sew next.
I learned to paper piece before I found out about that persnickety 1/4" and I think the transition was easier because of it. I also had a faulty ruler when I first started quilting and I could not get any of my swap blocks to measure whatever was needed until I resorted to paper-piecing. I kept thinking it was me until the lightbulb went on and I actually compared my ruler to a carpenter's tape measure. I thought I would never be able to rotary cut & piece until then. I had sewn clothes from Barbie size to XXL for 30 years and never had a problem until I bought a "quilting" ruler that was out to get me--LOL!