If you are organized, conscientious and would never ever DREAM of carrying a balance on your credit card month to month, then you're a good candidate for churning. Two recommendations in particular:
1) Set up a system up front that ensures you'll succeed. Review your credit report before you start and make sure everything's ship-shape.
Then develop a spreadsheet with several tabs:
- one tab for tracking your credit card sign-up's including bonus criteria, annual fees, progress towards minimum spend for bonus, date when you need to cancel the card by, etc.
- one for tracking your point balances (you can also use Award Wallet for this)
- one where you keep details on all your loyalty accounts (airlines, hotels, etc.)
- one for keeping a list of all the cards you've ever had with info on when you opened and/or closed them, credit limit, etc. You'll need that last one so you can know, at a glance, whether you're still under Chase's 5/24 rule (or any other similar restriction).
When you sign up for a new card, immediately establish online access to the bank/credit card company and set up automatic payments so you never get hit with a late fee for missing the first payment (I've had this happen once or twice and learned my lesson). Note that sometimes autopay won't kick in until the second cycle so you need to pay the first bill manually.
2) Figure out how to accrue points and miles in a way that makes sense for you and your lifestyle. The big points bloggers are all about using miles for luxury long-haul flights to Asia, for example, and while one of those can be fun to try, if that's not your scene then don't waste your time chasing those redemptions. If you mostly travel domestically and have a spouse you want to travel with, for example, working towards getting the Southwest companion pass is probably your best bet. If you love visiting Hawaii every year, google blog posts on the best strategies to get to Hawaii on miles. Don't play someone else's churning game, play yours.
And good luck! I've had a lot of success churning and sometimes it feels too good to be true, but it's not!