I have found using small craft pegs with the stitch symbol attached used with parked threads really helpful. Especially on HAEDs 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. Its very good. Although Ive never been able to park. I do one colour at a time & thread through the back of existing stitiches. When youre doing something complicated like a TW piece, with a million blends that all look the same, theres no way my poor brain can handle parking as well!