The arms & magic loop
Brace yourself. It's time. Time to learn the magic loop. Pick up the green yarn and watch this tutorial:
Magic loop giving you trouble? Try this easier chain 2 method instead. It'll probably leave you with a hole in the middle, but that's OK – you gotta do what you gotta do to make a circle.
Whether you made a circle using the magic loop or chain method, give yourself a pat on the back for finishing Round 1.
Now that you've gotten lots of practice crocheting the single crochet and half double crochet stitches, you're going to get a crash course in a lot of new stitches:
Grab your magic loop earlier and let's make the rest of the first arm:
Round 2: 4 inc (8)
Rounds 3-4: sc, 2 dc, sc, 4 sl st (8)
Round 5: 8 sc (8)
Invisible fasten off leaving a long tail. Stuff lightly.
Since the arms are so small, it can be easier to work with if you stuff them with scrap pieces of yarn instead of stuffing.
Thread a needle with the tail. Use it to sew the arms onto either side of the cactus body, spanning rounds 8 to 10. The arms should curve up.
When you've attached the arms, it should look like this: