You can only home slaughter for yourself and immediate family. There are licenced, mobile slaughter units in some parts of the country. You can not legally use an itinerant slaughter man.
10 weaners is going to be a lot of pork. Say you keep two you need at least another 8 people to take a whole pig but in reality no-one takes whole pigs. You might be lucky and get 16 to take a half. In reality people want a bit of this and a bit of that. You need to know before your pigs are ready that you have customers and then you will be lucky if someone doesn't let you down. Have you priced up finishing a pig and then done a costing for your pork?
So, you decide to home slaughter two for yourself because those you are selling will have to go to the abattoir. Have you got somewhere to stun, bleed and hang. Have you dehaired a pig with a sharp knife and scalding water? Have you somewhere to cut up and process? And do you know how you are going to dispose of the waste products?
All sounds more stressful to me than a trip to the abattoir where a vet will look at your meat and tell you it is fit to eat. Not the slaughter man.