Here, points to remember are:
1.a)For NOR gates, OR-AND logic is suitable to construct with.
1.b)For NAND gates, AND-OR logic is suitable to construct with.
So, don't try to construct the circuit directly, better start with above points to avoid errors.
2.Bubbling is just like 44 = -(-44), which is next step after starting with point 1.Here, bubble means putting a NOT gate, you all know.
3.Replace the bubbled gates with NOR or NAND accordingly.
Bubbled AND = NOR, Bubbled OR = NAND.
So, With compliments: 6 NOR gates, Without Compliments: 9 NOR are needed in our question.