Ski expedition to the North Pole — is a complex mission that demands a good physical and psychological preparation. It is always better to enjoy the trek than to suffer of it. In order to estimate your abilities and prepare yourself better, you ought to know what to expect.

Physical exercises.
You are going to walk on skis or afoot (depending on the ice conditions) for 8-10 hours daily for 8-10 days. Besides, you have to pull 40-50 kg expedition sledge with equipment, fuel, and food. The ice surface is mostly rugged, making smooth and comfortable sliding pretty unlikely.

Cold.
The air temperature in the Pole vicinity during the expedition period lies usually between -20 C° and -35 C° and it is good if you have endured it in the past. Apart that wind may dramatically increase cooling effect. Daily temperature deviations in the Arctic are not significant in April. Sun neither sets nor rises high over the horizon.

Conclusions.
Consult your doctor before making up a decision about expedition to the North Pole. 
Previous experience of the tours, ascents, expeditions and winter camping could prove very useful. 
Doing various winter sports would be very helpful.