Avoid using a comb or brush on your hair grafts
Grafts may start falling at this stage, but it is not a big concern as you will get the natural growth back within 3 4 months.
Keep your donor area neat & clean for that you can use some sprays and creams as your doctor suggests.
Keep yourself active with regular jogging or walk. A little exercise is required to stretch your neck.
A little swelling can occur sometime and can remain for a few days, but it's common after a surgery like this. You can apply ice cubes on it for relief.