Only someone who has skills in home improvement can replace an interior entry. Handyperson or licensed contractor does not cost too much – you can afford it. And choosing competent design professional you will never regret about it. Before installing new custom wood doorway, get knowledge about its parts and determine: do you have all you need for replacing it by yourself. Maybe you will need to replace the jamb as well. If you hire someone for making this work it would be great to have some basic understanding in things to be done – read a special books or articles. Be ready that this process will take few hours per entry. Normally, handyperson or contractor can make this work for one hour. It all depends on skills.