In reply to Nicholas Livesey: If you're nervous about it, how about a bit of practice on a local motorway in the evening when it's quiet?
Ditto the actual journey..... go at a quiet time.
My advice would be stick to lane 1 as much as possible until you're acclimatised......
Biggest point though is WATCH OUT FOR YOUR BLIND SPOT when changing lanes.
All cars have a bit of a blind spot, so if you're changing lanes and there's a car on your rear quarter you may not see it unless you physically turn your head to look.
You can also try the method of looking in your wing/rearview mirror, pick a car behind you in the lane you want to change to and do not pull out until that car passes you. The effectiveness of this really depends on your own skills in the use of your mirrors.
Also, indicate early. Don't whack the indicator on and change lanes!
Also, putting on an indicator does not give you the right to pull into the next lane. Its on YOU to make sure that there is no traffic coming up behind.
Last one....... if you're stuck behind a slow car/lorry and want to overtake, don't stay right up close behind it and change lanes then accelerate to that lane's speed.
Instead, pull back, wait for a clear gap in the lane, indicate, then accelerate in your own lane THEN change lanes.