All the jobs listed above are certainly feasible, and there are no qualifications required to do them in your own home.
A pro will always do these jobs way more quickly to the same or a higher standard. If you have the luxury of time, fire ahead, you'll get a great sense of achievement from completing the work yourself. If however there are deadlines and family to consider, you might be best enlist some help as the volume of work and stress of organising life around it can be testing.
Talk to your plumber and electrician before studding the walls to make sure you consider where all services, cables and fittings will go. You don't want to have to re-do any work because a stud in just the wrong place, or extra support for a sink missing.