I took allergy shots twice per week for 20 years. Each shot hurt for two days ans about the time the pain was gone it was time for a new shot. It was 100% worth the suffering as my allergies are basically gone.
We just got our second dose (wife and I) 1.5 hours ago. So far just like last time, just a needle stick. No discomfort at all. Like the parachutist with a defective parachute, so far so good. With luck, it will be like the first shot, just forgotten about.