Something to bear in mind, however, is that "training wheels" are often available as "optional extras" for Linux software: They might not be obvious, but frequently they're available.

Take mplayer. You use it to play a video file by typing mplayer filename in a terminal. You fastforward & rewind using the arrow keys and the PageUp & PageDown keys. This is not overly "user-friendly". However, if you instead type gmplayer filename, you'll get the graphical frontend, with all its nice, friendly , familiar buttons.

Take ripping a CD to MP3 (or Ogg): Using the command-line, you need to use cdparanoia to rip the files to disc. Then you need an encoder. . . It's a hassle, even if you know exactly how to use the packages (imho). So download & install something like Grip. This is an easy-to-use graphical frontend that uses cdparanoia and encoders behind-the-scenes to make it really easy to rip CDs, and even has CDDB support to name the files automatically for you. 

The same goes for ripping DVDs: The number of options to pass to transcode is a bit of a nightmare. But using dvd::rip to talk to transcode for you makes the whole thing a simple, GUI-based process which anybody can do.

So to avoid #5b issues: Remember that "training wheels" tend to be bolt-on extras in Linux, rather than being automatically supplied with the main product. And sometimes, "training wheels" just can't be part of the design.

關于trainning wheels的問題。。。我個人比較贊同毛大牛的觀點
i.e. 我們要先最naive地走一遍，了解它究竟是如何工作的，then 我們可以使用各種輔助工具。
我以為，沒有必要每次重新發(fā)明一個輪子，但我個人比較傾向于先了解一下輪子是怎么做出來的。。。然后當然不會自己造輪子，而是使用最好用的輪子～～～我相信這無論是對我使用輪子還是在需要的時候對輪子做出點小變動都是及其有幫助的。

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