nipple piercings???

Hey so I've been really wanting to get my nipples (or nipple) pierced for quite some time now, and I'm 85% sure i will get it done. Anything I have to know about this? The pain rate? I've had my tongue, cheeks, lips and nose pierced... Is the pain similar to any of those? And how long does the pain usually last? Will my man be able to lick/suck on them? So many questions lol