Data cabling for 1970s house

hi guys,

have been thinking cable up a 3 bedroom house,

my plan is to run cables to each bedroom + the lounge + 2 ceiling/walls for aps + 2 cable to under the eave (for cameras with POE)

would it be difficult or worth to run the cable myself? would this cost arms and legs?

where do you guys normally go for data cabling? i emailed couple that found on Google, no reply.

thanks,

Sam