This pattern is written in English and uses US crochet terms.

Small pumpkin is about 2 inches (5 cm) high and about 2.75 inches (7 cm) wide.
Medium pumpkin is about 2.75 inches (7 cm) high and about 3 inches (8 cm) wide.
Big pumpkin is about 3 inches (8 cm) high and about 4 inches (10 cm) wide.

The pattern uses:

• 1.75 crochet hook
• yarn weight fine

This pattern is for the medium level crocheters but if you are ready to try I am always ready to help.
You should know basic crochet stitches including

• chain stitch,
• slip stitch,
• single crochet,
• decrease,
• increase,
• magic ring.