not on the head la..on the "batang part" only
how many injection dpends on your skin..and your age.. they usually predict how much based on your age and how "liat" your skin is.. the pain was like only 2 seconds,. back then i only need 2 injection when i was 12.

also some traditional tips is to bath with cold water before circumcise so your skin will (kecut)become more easier to be cut
im 23 now btw.. c'mon.. if 12 year old me can do it..why dont you