Thanks for the welcome
As far as socialization, they spent a lot of time getting used to each other between cage bars and such. In the beginning I'd take one out at a time and we'd go up to the other's cage, have a chat, etc. I would never have introduced them if either were aggressive, but Charles is the most friend-desperate budgie ever (his cage mate passed away earlier this year, sadly), and Lola is the gentlest giant around. She has never once bitten anybody her entire life. That being said though their actual introduction was an accident as Charles snuck out of a feeder door when I was changing his water, flew right up to Lola, and got to preening! I very very closely supervise them at all times but they do love each other so.