I am thinking about paying my student loans off in one go immediately. Anything I should consider beforehand?

They have about 5% interest. Ive already considered the fact that I could likely make more interest income by paying this off monthly and putting the rest of the principle into an index to offset. But with uncertainty in the market and frankly the mental weight of the loan itself, I kind of just want to get rid of it.

My question is more along the lines of, should I use a credit card? Should I get a specific credit card that would maximize rewards for paying off loans? Are there other things im potentially forgetting about or other downsides to paying off all at once?