All advise here are good!
But first: STAY COOL IT 'S EASY TO DO!!!
Like you I descovered MF quite recently and was lost... :-)
But respooling is really easy. My first try and succes was done seated in the dark on the toilet (darkest place in teh house, and be seated is quit comfortable), with film, 2 empty spools (620) and my hands in my darkest jacket used as changing bags (hands passing reverse by the sleeves). It took me less than 5 minutes, it was so fast that I was sure to have made someting wrong ;-)
Next time same condition, less than 2 minutes. And now with a changing bag, it's a little bit faster but I don't have to lock me in the dark :-)
So enjoy shooting with your old camera!!!