I'd like to know how to paint around spindles white carpeted stairs

If the rug fibers are relatively smooth you could get away with tape, if the fibers are deep..... I like this homeowners solution.... https://www.youtube.com/watch?v=cp6ESxT1Gpo

Me neither! I would use at least a dollar store plastic tarp and tape it down well. Or run a roll of paper down the stairs - anything to protect the carpet from drips. Think about a painters mitt, quality does matter - don't cheap out. See if these sites help.

https://youtu.be/5_QBOuN5B-o

https://goo.gl/images/wZvFzq

https://www.amazon.com/dp/B000H5Q6EM/ref=asc_df_B000H5Q6EM5436177/?tag=hyprod-20&creative=394997&creativeASIN=B000H5Q6EM&linkCode=df0&hvadid=167138874211&hvpos=1o3&hvnetw=g&hvrand=9720562484111308895&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9031180&hvtargid=pla-307068311183

You can use painter's paper with a tape edge. It comes in a variety of widths and even comes in a film.

No, I wouldn't risk it. Plastic, tape and possibly a canvas drop cloth.

I agree with above comments. Use tape and some sort of drop cloth to protect the carpeting.