To encourage you, I too found what Julie found. My two girls used to constantly fall out, and like pisces, I used to assume they needed time away from each other. My youngest came out of school first, and my eldest followed a year later. I had lots of reservations about my eldest coming out, but the biggest was really that DD2 and I had built up this lovely life together and I thought that with DD1 at home too, it would be transformed to a stressful life of bickering and fighting.
For the first few weeks, it was. I had a resentful DD2, who thought DD1 was muscling in on her life, and a DD1 who was determined to stake her claim no matter how pushed out little sis was feeling. But gradually, I noticed things starting to improve. Noticed them talking to each other properly, noticed them behaving as though they actually LIKED each other!
Now we are a year and a half on from then, and they are better friends than I would ever have thought possible when they were both in school. They have the odd moment of irritation, but generally they chat together, play together, look out for each other, get on well.
The main thing I would say, which I could never have said when they were at school, is they seem to be on the same team nowadays. They pull together for the greater good of the family. They are no longer adversaries fighting each other for things. Rather, they collaberate with each other for them.
Managing two at home was harder work at first, but now I don't know how I ever had it any other way.
Good luck, whatever you decide.