Had my first one this morning. Nothing to report yet except a bit of bruising at the injection site.
I've no particular concerns, although can't say I'm that bothered about getting it either. For me, the main benefit of getting vaccinated is to protect me from whatever bureaucratic rubbish Boris and his bunch of feckless halfwits dream up next. I reckon being vaccinated will make travel easier (no quarantine requirement for the vaccinated to the US for example), it'll make work easier (vaccinated folks aren't required to wear masks in my workplace any more) and I reckon longer term it'll be a help in planning social events and trips.
Compared to these benefits, the frankly infinitesimal reduction in COVID related risk is almost completely irrelevant.
I'd also note that it's a strange position to take that the (tiny) risks posed by COVID are a good reason to not care about the disease, but that the (even tinier) risks presented by the vaccine are of great concern and a good reason to fear taking it. Either be scared of stuff with minimal risk, or don't, but at least be consistent about it.