Hey y'all. Two different questions here. Open to advice on just one or both!

I'm 28(F) and I have known I was bisexual for literally forever but I have never given myself the opportunity to be with a woman. I'm at the point in life where I'm finally feeling comfortable enough to get myself out there and have my first sexual encounter.

First question. For those who didn't have their first same-sex encounter until later in life, what was it like? Was it hard to find someone willing/able to show you the ropes? How did you allow yourself to open up? Generally I can only gain confidence through experience, and since I have none here, I feel like I'm still stuck in my shell.

Second question. For those who are bisexual and in a straight-passing relationship where you practice ENM, how hard was it to find a sexual partner that is OK with this? Some background -- I currently have a male partner of 5 years. We practice ENM; we have some light boundaries but are willing to do certain things both together AND separately. He knows all about this part of me and he wants me to get out there and have my first sexual encounter with a woman. He's my biggest cheerleader. If he could hold up pom poms and cheer for me while I'm doing it, he would. But it seems like, by nature, he's also my biggest hindrance. I am finding that as soon as I tell a woman about him, they disappear. I am not even asking for him to be involved. I just want to be honest and transparent and have them know he exists. Then POOF, gone.

Any advice here would be greatly appreciated.