So sorry for not spotting this earlier. I haven't been on for a few days.
Don't worry if she is wearing a rug the rain won't bother her. The only fussy thing about rugs is that you are supposed to take them off daily to check that there have been no rucks or creases that could be uncomfortable ( like getting a stone in your shoe) The only likely trouble for you is if the sun comes out her desire to roll and scratch her back will often make the rug displace or a buckle come undone.
As for the irritable bit, again she is just used to a routine and she is also used to a certain person doing it, so she probably just confused. You are also likely to be a bit slower and even that is a factor. ( think about how long someone takes to changes a babies nappy when the task is unfamiliar and how wriggly the baby gets).
If you have not been warned that she kicks or bits then please trust me she wont. so try to enjoy this time with her, when you give her her feed, just stay with her, she will be glad of the company. Listening to her rhythmical munching can have a really calming effect for people. I will watch the forum more carefully . I am in Tewkesbury if you need me I can pop over. good Luck and enjoy your at "onenesss" time.
On the issue of animals for research "The question is not, 'Can they reason?' nor, 'Can they talk?' but rather, 'Can they suffer?'" Jeremy Bentham