My little guy was like that at first but now he's an old pro
I found when I interferred it would distract him so that didn't help with me either.
I found that if they were on carpet, he had better traction and that helped for him. If he's shorter than her, maybe rolling a carpet up to boost him up.
Actually for me, nature just took its course and he finally figured it out.
Tell your friend to make sure his male doesn't wear himself out and good luck to them.