Is it hard to learn how to tap dance

If it's something you're set on doing and you spend the time and effort to really dedicate yourself, it shouldn't be too hard. However, it is true that natural ability and innate talent will eventually go farther than just hard work (because there can be a limit when you can't work any harder than just being "ok" at tap). You definitely shouldn't let this discourage you, though, because you might secretly be talented and it may come easily to you. 
Go ahead and give it a try!

Not really. If you have natural rhythm, then you should be able to learn it fairly quickly. The bast way is to get private or group lessons. But you can also go to You Tube and type How to Tap Dance. There are quite a few videos.

It depends on how good you are with dancing to rythym and how fast you can move your feet. It is personally hard for me. If your younger it will be much easier for you to learn how to tap faster. You'll have to work on it a lot though to get used to moving your feet so fast and working on your balance in which you need to tap dance. In the end, it depends on your balance and rythym

Not so easy! In the film, "Singing In The Rain", Danny Kay had to have a champion tap dancer who was carefully filmed doing the steps; I met this man, and he stated that he had to buy a pair of tap dancing shoes to match those worn by the super star. 

Some find it easy, some find it difficult. 
When I tried, I looked somewhere between a maniac stamping on ants and someone bursting to get to the bathroom. 
It was BAD!