Wanting To Read SICP

So, /prog/ gurus, I finally decided to try to tackle what everyone has been yelling about.

First question - what interpreter is the most widely used for scheme, and which one should I use?

Do you think clicking the key F is simple?  The mind is a very complex computer and the act of clicking on F is extremely complex involving lots of fine tuning.  All of this tuning and learning is hidden from your top level of thought (that you experience).
And how do you know that? Can you prove it? You can't.
And no; not everything is a program.