Ok il try to keep this to the point. Property is semi detached. Bought cheap as a project for my first home. Property has been gutted entirely. Old lime plaster removed as was in bad condition due to wear and tear. Bricks have been cleaned with an angle grinder on low speed with using those wheels used to remove rust, bit like a flap wheel. Bricks are spotless and in good condition despite below DPC.

Mortar is mostly intact and spot on, only a few square meters need re pointing. External walls are double skin with cavity, red terracotta bricks with 3 holes in centre. Lime mortar used everywhere.

Outside, the house is rendered in pebble dash and that thick weather proof paint, except for the bottom 1.5 meters is bear brick. This brick is half lime mortar and at some point the side wall and half the rear wall have been re pointed with cement.

At some point DPC has been injected, I believe unnecessary. No current signs of damp. Rear wall has blown bricks below second DPC line similar at side of house. Could this be to DPC injection and cement pointing trapping water?

What I would like to do is wet plaster entire internal walls and render the entire outside property.

My questions, do I hire a builder, a plasterer or someone else?
1. Should I check if they repoint with lime inside and out as is original or is cement OK if they suggest?
2. From what I read I would like hardwall internally not sand or cement and definitely not dot dab etc. I already had one local builder tell me i shouldn't seal the house this way and lime would be best inside? I have multiple vents and air system in loft so this shouldn't be a problem? Plenty of escapes for moisture.
3. Now the outside, does anything need to be done regarding the blown bricks such as removing the cement mortar? I also assume a lime based render should be used outside so the external wall can "breath" if that is a thing? I suppose theres water in the cavity and in and out from the outside and ground up?

Honestly no idea where to start who to ask or what order.