At first I thought riding a tandem was going to be difficult for the two of us. It requires a lot of trust and communication on both our parts. I have to trust his steering and braking abilities and we both have to communicate our actions or needs such as shifting, coasting, standing up in the saddle, or maybe providing a warning of a potentially uncomfortable bump we are approaching on the road. Tandem riding is a whole different level of effort because of the need for a good communication style. Thankfully, my partner and I have a pretty good system that seems to work for the both of us and our tandem rides are almost always a pleasure.
We are still on our first tandem, a Burley Rumba, that we found on Craigslist for a very good price. We have had to make some adjustments to the bike as far getting the captain's cockpit up to his standards and making my seat and handlebar reach a better fit for me. I had to try out a few different saddles. I was quit pleased with the Brooks B-17 Standard saddle, but was having some crushing issues after a couple of long rides - let's just say I was walking a bit funny for a couple of days and leave it at that. I still really like the comfort of the Brooks, but for some reason I could not get it adjusted just right for long-term rides. I did a bit of reading and decided that a cut-out saddle would probably be my best option giving my crushing problems I mentioned earlier. Luckily my partner had an extra, Selle An-Atomica Titanico saddle that I could try out and so far it has been working beautifully.
My partner and I have the advantage of being roughly the same height so finding a properly sized tandem is not a problem, but he has a longer reach than I do and I have slightly longer legs than he does so it took some minor adjustments to get everything "just right." I had to raise my seat post considerably, which was making my knees almost hit my handlebars while riding. Our solution was to buy a longer handlebar stem, which has been working quite comfortably so far and keeps his bottom from from rubbing the top of my handlebars. We still have some work to do on our tandem, but getting the comfort level dialed in was a big priority. If you are not physically comfortable on a bicycle than the less likely you are going to ride one.
Tandem riding is a craft in its own way. It's about finding the right kind of equipment and set-up that is specific to your own needs (which applies to any bicycle riding) and it is also about learning to work and communicate with another person. Not only is the ride a challenging physical task - it is a challenging mental task as well.