Just in case: use an editor with support for Scheme. If you want something easy to install, try DrRacket. - tab indents the current line - cmd-I (or ctrl-I)

Just in case: use an editor with support for Scheme. If you want something easy to install, try DrRacket. - tab indents the current line - cmd-I (or ctrl-I) will indent the entire buffer - Press ] to insert a matching closer (an parenthesis, bracket or brace) When you need it, install the `sicp` package to get the Henderson picture language (and more) used in the book.