This advice is working well for the types of pdf's that interest me (mostly history journal articles):
https://www.mobileread.com/forums/sho...55&postcount=7
The above link may be the most helpful (to me) post I've yet seen on this board. To recap, send the pdf(s) to one of your kindle addresses (I use my @free.kindle.com) as attachment(s) with the following in the email subject line:
Convert