That'll work! Always beware of things on places like YouTube etc. Just because someone can make a video doesn't mean they know what they are talking about!
When you've trued a tyre try to smooth it out with some 80 grit abrasive paper and round off the edges a bit so it doesn't dig in when cornering - round off between the tread and the sidewall. Newly trued tyres will be a bit iffy until they smooth out, so give them time in the early part of your first race. HTH
