Are you clear about what you want them to do, give medication, meals, help with personal hygiene? Whatever you do, don't take on yourself the things that you can' t manage, and don't under play things with the social worker, give her/him the worst case scenarios.
If they can get you to do it for free, they will!
good luck.
Get a care plan in place before the carers start working and any required equipment. Make sure you understand how to use this yourself before the carers attend.
Work with them initially (if not all the time) to ensure they work to your mother's and your standards. Give them a chance, they can become indispensable if you look after them. Hopefully they will log in and out so you know they are there the specified time.
Never to ask your mother what she would like doing, she will probably say nothing I am alright, but to do what it states in the care plan regardless. Make sure they understand her medication,, how to prompt and how to check she has taken the right medicine at the right time of day.
To contact you with any issues and to write in the care log precisely what they have done at each session. This becomes useful for later issues.
To have their phones switched off whilst with your mother and to sit and speak with her if there is any time left after the jobs are done.
To post you/your mother a weekly list in advance of times and carers attending and
to phone you if a replacement carer is coming, also if they are running more than 15 minutes late.
I could go on but I think this is enough for now. Make sure your have the domiciliary company owner's name and email address, you will need this without a doubt. Get to know her well.
Good luck x