Hi Sweetpeas
I too traced my birth mother at the beginning of last year and went off to Singapore a few weeks ago to meet her for the first time (she lives in NZ so we decided to meet half way). I was terrified all the way there on the plane, but it was an amazing week and I feel very lucky to have her now. I know why I was given up and am comfortable with things.
My advice: I think it helped that before we met we had been in email contact for over a year, so things started really slowly which gave us both time to process all the emotions. Also, although it was pretty terrifying going on my own I'm really glad I did as it meant we got some proper time together to really connect, without having to worry about anyone else. I would also try as much as possible to think of everything from her side too - I didn't realise just how much she went through when she got the initial letter and all through the first year of contact really. It was like digging up the awfulness for her all over again (like ChildofIsis said), and seeing pictures of me really brought it home to her what had been lost - all she had of me before was a picture from when I was 2 months old that she carried around in her wallet for 30 years. I couldn't believe that she had thought of me all these years (although I don't know why, you don't really forget giving birth to someone!) and I now feel very wanted and cared for, by both her and my adoptive parents. I know I am very lucky.
I did find that my emotions hit me like a brick wall when I got back from the trip, as although I had a very happy upbringing with my adoptive parents, I felt very sad for the lost years with her. There are so many positives though, I now know where I get my silly laugh from and sense of humour, and my obsession with having everything matching! Also, my birthday last December was amazing as she was able to send me a birthday card for the very first time! The challenge is, both during and after the reunion, to always look forward not backwards on what could have been, and enjoy the relationship you build from here on in, rather than dwelling too much on 'what if's.'
I also now have another rugby team to support!!
If you want to pm me I am happy to chat, I know what it is like with random emotions popping up from nowhere - they describe it as a rollercoaster ride, pretty accurate IME. Wishing you all the very best with your reunion, very exciting for you!