While I have limited experience on this route, O-S-M to Somport the beginning of April this year, so a limited snapshot, my takeaway is this. If you’re expecting something like the CF, this is very different. Some of the GR routes, this one for sure, are less traveled, often more rugged and if you go early in the season, you may not encounter other pilgrims/hikers except at the albergues. We encountered exactly 2 others until Candanchú.
While we were on this section, there was still considerable snow on the ground (Bedous to Somport) and the runoff was substantial, often the trail was a running stream. Approaching the pass, what appeared to be lovely green meadows were often bogs which I sunk into mid-calf (so much for white liner socks and dry feet). The last hour, even in the glorious sunshine and nice temps, we took the road as the path was indistinguishable.
Please don’t let this discourage you, it’s a beautiful route but as we’ve all seen/read, flooding and washouts are common. My experience was quite early,
@trecile was about a month behind me and her experience may be a better barometer of what the OP could expect.
Be prepared, adaptable and realistic about your ability. Others have posted great info, read that. If you can, communicate with anyone along the route to get current info.
After all the buzz-kill, I loved this route. It was beautiful and for a brief moment I was 19 and backpacking in Wyoming again. The Aragonés is stark, solitary and ruggedly beautiful. Puente la Reina came as a shock because of all the people. The 4, 5 or 10 pilgrims you’ll meet will become your tribe for a while.
I hope this helps and I hope you enjoy your journey.