Getting through customs wasn’t all that bad. You fill out a little card (with the address of where you’re staying whilst in London) and they give you a stamp. Then off you go.
The bigger deal was using the Underground. The learning curve was huge and it probably took us a good half hour to figure out the best (and least expensive) way to get from the airport to Paddington Station.
It didn’t take long for me to decipher the Tube Map and before long I was picking and riding trains like a pro, or least how I imagine a “pro” might pick and ride trains.0