Actually, I don't mind curves ...

Not easy but once I'd got into the swing of it, they came together okay:

Sew the pairs together:

Then into halves:

Make into a square:

Iron the seams open (I don't usually) and it makes it lie much nicer:
Appliqué the centre circle and this is the finished block:

D'you know - for a first attempt, Im going to say this is 'good enough' - infact not bad at all. And my glass is empty so that's enough sewing for tonight ;)