Hi Jo,
Last year, I started in Pamplona: Very nice, with a flight in to Barcelona, bus to Pamplona (5 1/2 hours), went to the mun. albergue and got my credential and a bed the same evening, and just started walking next morning.
I understand that one of the hardest passages is the very first day from SJpdP to Roncesvalles (25 kms, with a possible stopover at Orrison, where you must book in advance only) so that could be tough. By starting in Pamplona, I avoided that and got a light start to my Camino.
I just checked my camino planner for you and found that the longest stretch without an albergue was between Carrion de los Condes and Calzadilla de la Cuesa (17.1 km., flat terrain). Other than that there are just a few etapes that are more than 10 kms. Other than that, albergues are found all over. I am absolutely sure you can do it.
I don't know how much time you have, but I would suggest you do not get into the pressure of walking 20-25-30 kms/day: Walk
your distance and relax.
And do some planning of the stages: Here is a great and fun place to do it:
http://www.godesalco.com/plan
You will find out the distance between your planned stops, elevation, indication of ascents/descents , remaining distance, etc. Very helpful and inspiring when you sit in your armchair doing planning
You can print out the whole camino with your own suggestions for stops, laminate the sheets and take them with you on the walk. I did, and it helped me a lot.
Buen Camino!