I've also heard to skip Z (as it looks like a 2) and Y (apparently it can look like and X? I don't really get this one, but skip it to be safe...). Also, you shouldn't write 1 like they have here as it could be confused with a 2. Without the base, it can also be confused with a 7. I tend to use just a vertical line, as it can't really be confused with anything if you always skip I.
Of course, you could just use the much superior European Slate-Take system, but that's an argument for another day.
I also call the slate as soon as they roll sound, so that the beginning of the audio clip has the call, then wait for "rolling" or "mark it", say "marker" or "A mark" or "A-B Common Mark" or whatever it is and clap the sticks. There's no reason to call the slate and clap the sticks at the same time.
It's pretty easy. Add a film you worked on here. http://www.imdb.com/updates/guide/adding_new_title
If it qualifies (which isn't hard) you get a page as a member of the crew.
If a film you worked on site not credit you, just edit the credits and as yourself.
A faster computer is always the ideal option, but not always the best option. If you can afford it, yes you should.
Another option is to offline edit:
1. Convert all your 4K Raw footage to a smaller, easier to work with format (eg. low-bitrate Prores or DNxHD) with Adobe Media Encoder.
2. Edit with these new files.
3. Right click on the clips > Make Offline, and then right click again > Link Media, and relink to the original RAW clips.
4. Do your grade and VFX with these originals.