To those who are nervous/apprehensive about the move... it's only natural, especially if you come from a close family! Me and my family are extremely close and things like Facetime and Skype are blessings. We keep in contact all the time. With that said though, it is still very hard at times. There's a part that's missing. In the same token, living back in the US with my family there was still a part missing being away from my long term British BF. I still have my "moments" occasionally but the busier I keep myself the easier it is. BF is very supportive as well.
Also, don't think that you need to fit a certain "mold" to move to the UK! There were those who were leery of me moving because I'm more reserved and I've never been too adventurous. I guess they expected for someone to successfully live in another country, things like being outgoing, assertive, and adventurous were requirements (aka things that don't come so naturally to me!). Perhaps those traits do help, but they're not everything. I've found, for example, that patience and open-mindedness are extremely important as well.
Also to those who are thinking of or in plans to move, I highly recommend visiting first if you can (if you haven't done so already). I visited four times before I moved and I definitely think that familiarizing myself with the UK helped with the transition and what to expect. It's still entirely different living over here though. I've been here since September and it's been a slow work in progress over the last few months, but I finally feel like I'm finding my footing here. Joining a gym, looking for volunteer opportunities to build up my CV and get UK experience, etc. Still haven't made any friends over here, so I'm considering meetups too.
I could go on and on, but I'll leave it at that for now.