Hi
When i first started cm'ing i was as unsure of myself as you are, but then you realise the parentsd dont have a secret camera making sure you give their dd/ds your complete undivided attention every second of every minute theyre with you ..so basically i treat the children similar to my own!
I make sure we have plenty to do, i help when needed/asked, i lead play, i gets drinks/snacks/tissues for snotty noses, change nappies all through the day..the list goes on..BUT...if i ahve babies and theyre sleeping or older children and theyre busy with a safe activity in the rbeakfast room for example, i will empty the dishwasher to save me having a pile of unsightly and unhygenic pots in the sink, i might put a wash in if needs be, or if children are in garden, ill hang one out, if raining ill put clothes on radiators, often they help me, working out which ones will fit the towel/bed sheet/dd's vests on etc..if we've trailed a laod of mud in after being out, ill hoover, sometimes right through the ground floor ..as long as..AND this is the important bit..the children are safe, happy and you are still there and ready to do whatever it is they need.
if i have had to hoover downstairs which usually happens maybe once a fornight if we've been to park/using glitter etc, the children love it as we see who can grab the most toys of the floor, then they can have a ride on the sofa's (they come apart) if i need to move them out etc.
I DONT set out with a list of housework to do in my working day, but i have no probs putting a wash in, emptying dishwasher or wiping the kitchen tops down, its day to day stuff and we DO work from home, so it CAN be done..every course ive been on so far to do with the EYFS, we've discussed this and how to involve the children in 'normal day to day things', we were even shown how to make cool 'dusting' puppets on one ...so before you do what you need/want to do, just think if it prevents you doing your job properly?, if not and it doesnt take up time you should be doing something for the children, i have no probs in doing it and neither do any of my parents..good luck getting started