Having re-laced a wheel myself for the first time at the end of last summer its a doddle,, the hardest part for me was to source the right size spokes,. and while not the best solution amazon prime saved the day allowing me to buy and return only to replace with 1mm longer etc.. with a rapid turn around
to measure a spoke removed for sizeing,(if you have one available), find a ruler which measures from the end and hook a spoke over that end of the ruler, and read off the length, subtracting 1mm for stretching.
If using a multi spoke spanner with lots of sizes, tape off all the sizes you dont want to use, it will save hours....
an old spoke makes a good tool for threading end caps into wheel recesses.
be mindful anazon spoke sets at least, come with exactly 36x spokes and caps.. dont loose any..
And when it comes to beating up your just trued wheel for the first time wheel, dont hold back
One or two youtube vids on the subject and you will be well prepared,