Certified GKH Gardening Expert
I like to use sharp, clean pruning shears, or those kitchen scissors. Both will work fine. If neither of these are available you can use a sharp clean knife. You can dead-head, and cut off any dying leaves.
Here is an article for proper pruning methods: https://www.gardeningknowhow.com/ornamental/flowers/bop/bird-of-paradise-pruning.htm