I was always holding my paper up to the light to see where the next piece goes. I'd pin, then flip it and check to make sure I had a seam allowance and that my fabric covered the whole section it was supposed to. If I didn't have enough light then I wouldn't be paper piecing! When I had weird angles that was a whole 'nother scenario.
Someone got me this ruler and although the ruler is handy, the best pp tip for me came from the directions inside the package!
By the time I thought I'd take photos this is what I had. I sewed on the line on the other side of the paper. I trimmed the seam, then pressed.
Now this might be fairly easy to see where to put the next piece of fabric, but for the sake of this post I'm going to show you how I did it.
Turn the paper over so you can see your sewing lines.
Get an index card and put on your next sewing line. (I actually put it up a tad more then in the photo)
Fold back your paper against the index card.
Use your add a quarter ruler and use the little edge against your card.
Set your next piece on top of the fabric and you are ready to sew. No holding up to the light!
I did the same thing on the sides. Put your index card on the sewing line and fold back.
I really wanted a seam that was a bit smaller then 1/4" so I used my regular ruler. That works just fine.
Until I read about folding back the paper on an index card I fought with paper piecing. This tiny, easy trick has helped me immensely! Now, please don't tell me you've been doing this for years, OK?!