I have found using small craft pegs with the stitch symbol attached used with parked threads really helpful. Especially on HAED's it is much faster for me to find my threads without have to be too accurate with parking in exact spots. Takes a little time to set up but worth it IMO.
Thanks for the tutorial. It's very good. Although I've never been able to park. I do one colour at a time & thread through the back of existing stitiches. When you're doing something complicated like a TW piece, with a million blends that all look the same, there's no way my poor brain can handle parking as well!