basically its a numbers game we play when brewing. the air around us contains spores and microlife in abundence not to mention the bacteria and yeast that are crawling all over our skin..
and we are preparing a microlife baquet in abundance 5 gallons of it in most cases.
the probability of preparing a kit or any brew in a domestic environment and getting it into the FV and lidded without anything unwanted landing in there too is astronomical, you have a better chance of winning the lottery 6 times in a row,
Our secret weapon is the HUGE population of yeast we pitch in the billions of cells.
these out eat and starve off any competitive microlife in most cases, infections are rare when cleanliness and sanitation is carried out effectively.
just do what you can.. i use starsan and have used videne, in both cases I have a bowl of sanitiser to soak the bits and bobs that will get manhandled, the airlock bung or a corny lid for example, dipping my clean hands in to retrieve the items sanitises my fingers on the way in too
i did get some latex gloves but my hands feel uncomfortable in them, hot n itchy after a lil while, but its not a bad idea to use em if you can stand having them on.
if you use starsan a trigger spray bottle is great for dispersing it into bottles or onto fv inner walls.