The problem is that you cannot put things together just like making a bowl of soup or salad, and expect a human being as the results.

If you are thinking of getting an already fertilized egg, then replacing all of the chromosomes with that of the donor, there is no way to accomplish that with our present knowledge and technology. The "easiest" way, (AND it isn't easy.) is to replace both sets of chromosomes before conception. Once you have conception, the process begins, and the cells start to divide, and we simply do not have any knowledge as far as stem cell progression yet.

Once the progression begins, the cells then know their jobs, and follow the "pattern" which is dictated by our DNA. It is a LOT more complex than most of us can imagine

Again, the only way at this time, to clone an advanced animal like a mammal, would be to control the chromosomes before, and at the conception. If it were easy like starfish or certain amphibians, it would be no problem, but it isn't easy with mammals.