First advice... 17h is not too long.
Always difficult. Real breeder do not help for two reasons:
First, they don't want to have weak genes in their line. If the chick doesn't make it on its own, they don't want to breed further with it.
Second, The survial rate of helped chicks is poor anyway.
Nevertheless I help on day 20, if there is still life in the egg.
But be aware, many things can happen and survival rate is poor, as mentioned.
Think about helping a chick and hit a bloodvessel, bleeding to death. You will feel real bad.
I had this once, when I had no patience, in my beginnings. Or you are too early and the yoldsack hasn't been sucked in completly.
Also picking up died chicks from the bator or brooder also doesn't feel good.
If you dare to help, I can suggest a video, I was inspired ...I do it right this way (beside I place the chicks back in the 'bator to dry), BUT I do it on end of day 20 with eggs I still HEAR life (scratching, skrippling, pecking or peeping ... please do not do the water test). All losses then, would be lost anyway.
I helped 4 of these late chicks in my last hatch and only one made it and, as these lateties are always smaller as the rest, the suvivor was injured by the bigger ones with week four and I had to cull it.
So you shoud think twice, if you can handle this.
Good luck!