Since i've been having some "hapennings" with my polo i'm going to do a overhaul checkup, cleaning the throttle body, new HT leads, new distributor cap and a new distributor. To see if the engine stops misfiring!
I've read the instructions from haynes and it seems simple enough.

But I'm a bit unsure about point 2 - "Set the TDC on cylinder No 1", any pointers?
Is this absolutely necessary?
And should i be careful about something else? I already know how to keep the firing order 1-3-4-2
Any help would be aprecciated!