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

Bat is around 4.7 inches (12 cm) when finished.
Pumpkin is about 2.4 inches (6cm) high.

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.