Earlier quoted context omitted.
I'll warn that that advice is like "get a therapist". They're weakly regulated/certified titles, and there are many people calling themselves as such offering terrible advice and plans. I don't think they're worthless by any means, good ones are great. However, you need to carefully vet them rather than trusting their advice by default to the degree you might (or should be able) to trust a doctor or the like.
The primary function of a personal trainer / nutritionist is not the advice they give, but that they force you to show up at the gym and keep track of what you're eating. It's 90% outsourcing of willpower and 10% knowledge.
If you decide you want to work out and eat right, take responsibility for it and truly make the personal choice. Or buy a couple of self-help books to learn some techniques. E.g. The Power of Habit. It'll be orders of magnitude cheaper.