1st: People are always scared of what happen to your credit score if you cancel cards, don’t worry about that and pay you bills on time is the trick here to keep a good score. I’ve been doing this for almost 3 years now, I got 12 credit cards on me right now (cancelling, ordering new ones and cancelling) and my credit score is fine, see for yourself
To do the credit card turning also called « churning » trick to get welcome bonuses, you have to have a good score, if you just want to do one or two credit card only just to get 25k or 50k for one trip, don’t bother with this.
2sc: How to know your credit score. Well the only way to know your score is to open a account on Equifax website and you’ll know right a away but the cost is 16$ per month but there is a way to get it for free. Right now Equifax have a free trial for one month to know you score and see alert on your credit report here –> Equifax 1 month free trial and then you can cancel anytime before they charge you for the second month by calling 1-866-820-8911