Menstrual cups? What do I need to know about before I start using them?

Anonymous
Okay ladies, I'm thinking of changing from pads to menstrual cups. The main reason is because pads irritate me. I have been using them for two years now with the following brands and they all seem to not sit well with me:
Always - I use these the most. At first I liked them and then I somehow started getting slight scrapes and bruises from wearing them recently. (But they are soft...)
U by Kotex - For me, they are REALLY uncomfortable and a bit hard and causes slight scrapes as well.
Stayfree - They irritate my skin.
Carefree - These also irritate my skin.
See the pattern? Anyway I also have very sensitive skin. This is why I do not touch tampons in the first place. So I'm thinking of getting a menstrual cup. I have heard very positive reviews about them. What do I need to know before I start using them and does anyone else have the same problem with pads like I do?
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Menstrual cups? What do I need to know about before I start using them?
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