Lots of good comments.
Here is my 2 cents about the little critters, and taking responsibility for my actions.viewtopic.php?f=42&t=9586#p120581
That said, you need a system to make it work.
I leave small plastic containers, with tight fitting covers, in various places. Then when I see a little critter, I very carefully get it into the container and take it outside, and let it go with a mani.
For mice I use plastic have a heart traps, and let them out, with a mani, in the woods.
When I lived in NYC, for cock roaches, I would set out a tray of sugar water when I went to sleep, set my alarm to 3 am, and then vacuum them and take them outside to the garbage bin with a prayer that they make it to garbage heaven.
I think it helps to have some soft stuff in the garbage bag of the vacuum cleaner and just run the vacuum intermittently. Now I have a hand held, battery operated, vacuum that I can pulse with a trigger.
For ants you need to break the scent of the trail that they follow - so I clean with fantastic or a cleaner that has ammonia in it. If you can use organic cleaners, I am sure that is better for you and the critters.
For wasp nests - it works to hit it with a gentle stream of water from a hose. They get the idea and leave eventually. Don't stay around to watch them fly out. Spray and run away.
For little spiders - I mostly leave them alone, until the webs get too much like a haunted house movie and then I collect them all at once into the vacuum and then immediately put them into the outside garbage bin.
For mosquitoes, I try to blow at them, or flick them off, If I am mindful, and wish them a better rebirth if I am not.
I guess the key point is to do my best not to cause harm to any critter - big or small, and then to say Vajrasattva, for purification, and Shi Tro for better rebirth, for unavoidable accidents.
There is also a teaching called shen powa, which allows me to feel that I have transferred the soul (nexus of karmic propensities) of a dead critter to a pure land. So I do that too.
Far better not to kill or cause any harm.
Hope this helps,