@aussie62 you've already done the courageous thing by reaching out to this forum. The replies above are very beautiful and I can't add any further sentiments to their lovely words - only practicalities.
Be aware that 12 April is bang in the middle of Holy Week and it could be crowded and a bit crazy when you arrive on 11th - can anyone describe how big a thing Semana Santa is in Pamplona? Don't be surprised to come across floats with statues on them, and marching bands.
I find not being able to imagine things makes me more nervous - if you 'see' it beforehand, when you arrive there, it's already familiar. So you could have a wander about Pamplona using Google Maps Street View. Look who I just spotted when I dropped the yellow man completely at random:
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You can also find some videos of Semana Santa in Pamplona on YouTube.
As
@Introibo says, your nervousness is likely to last all of 30 minutes once you are actually on your way. Once you are in the channel, the camino current will bear you along.
Love and best wishes.