is getting smoke smell out of house a job i can do myself?

For cigarette smoke or a small kitchen fire, yes. Smoke damage across a whole house after a proper fire is a job for a restoration company. The smell lives in a film on walls, ceilings and fabrics, so air fresheners do nothing. Wash every hard surface with sugar soap or a degreasing cleaner, top down. Wash or steam clean curtains, cushions, carpets. Change the HVAC filter if you have one. If the walls still smell after washing, they need a stain blocking primer (shellac based is the strongest) before repainting. Ordinary emulsion over the top and the smell comes back through.