Originally Posted by: JimmyAlfordQuick tip: make sure that your thumb (fretting hand) is placed in the centre of the back of the neck and doesn't creep over the top too much. I wish someone had taught me that back in the day!

Oh yeah, dude. This ^ helps A TON with your reach, and is almost absolutely necessary for all advanced-level playing. Other than that all I would have to say is keep at it. difficult chord changes can be one of the hardest and most frustrating parts of learning guitar. But if you keep working at it with exercises like the spider legs exercise, repetition, and trying different things you will get it. With enough practice it will become like second nature.