Hi! Do I need a node to have a @OpenSecret Lightning Address?.
Nope. Download wallet then add federation and you can receive up to 200k sats into that federation then sweep funds into lightning once the balance is close to that amount. As of right now you have to subscribe to Mutiny+ to get that feature but I guess they will release it to everyone on Monday.
No, just need to connect to a Fedimint and mutiny+