In reply to Alistair:
A friend and I did Mont Blanc last month up the Trois Monts, down the Gouter.
Neither of us are experienced mountaineers but do some climbing back home, nothing that serious (especially if my friend has his daughter with him), usually just messing about with a top rope at Symonds Yat. We did our homework and read up as much as we could/thought we needed to.
If you're planning on doing it this year you may be out of luck with Gouter bookings. We made our arrangements at fairly short notice and got lucky. The Gouter was booked solid so I booked the Cosmiques instead. I kept my eye on the Gouter booking website though and a space became available the night after our Cosmique booking so I grabbed it. This meant that if conditions were good for the Trois Monts we wouldn't be forced to cross the Grand Couloir late in the day and stop at the Tete Rousse or return all the way to the Nid d'Agile. Had conditions not been good for the Trois Monts we had the option of just doing the Gouter Route.
We spent a week in the area, arrived on a Saturday and went to the Mer de Glace (up the railway then down all the ladders) for a stomp about (first time I'd used crampons, my friend had once before) and with the intention of practicing crevasse rescue technique (we opted for Mammut Rescyou each as they're so easy to set up).
On Sunday it was flip a coin between going to the Albert 1er hut or the Argentiere, we opted for the latter. We climbed the Petit Aiguille Vert before descending and crossing the Glacier to the hut. On the Monday we left the hut early to climb the Aiguille d'Argentiere. After a second night at the hut we descended the glacier to the mid-way station and back to Chamonix. The rest of the Tuesday and Wednesday we chilled out a bit. About midday on the Wed we headed up the Aiguille du Midi cable car and made our way to the Cosmiques. We left the Cosmiques at about 2am the next morning and successfully summited about 10am, we got down to the Gouter by about 1pm. A night in the Gouter and we were able to leave sensible time on the Friday morning to get across the Grand Couloir early morning before too many rocks were coming down.
I think our acclimatisation strategy worked, I was full of energy going up the Tacul but we were held up by some slower parties which we couldn't easily pass. I have to admit though that we found it tough on the final slog to the summit, I preferred to just keep up a slow steady plod but my mate seemed to be going faster but stopping frequently (not ideal when your roped together) but we made it up and avoided falling out so all was good lol
My concern was route finding and navigation, I was very keen to put all the waypoints in the GPS but the reality was it just wasn't necessary (path well trodden and other people about including guided parties). The only time we had the slightest navigation 'concern' was when the mist came in on the descent to the Argentiere hut from the Petit Aiguille Vert but a basic bit of compass sighting saw us right.
The L'Office de Haute Montagne had told us that the one fixed rope on the crux part of the Maudit was still buried with snow and ice. When we got there it wasn't (of someone had fixed another) but there was a bit of a bottleneck. I lead the first pitch but put a prussic on the fixed rope for security and used my knee to hold the slack end as I slid the prussic up. I lead the second pitch and didn't place any pro on the way up. For this part it's useful for the leader to have two (semi technical) axes.
I couldn't tell you how much difference the acclimatisation made but I feel we did the right thing with building up to it and spending a couple of nights at a reasonable but not silly altitude. I certainly wouldn't attempt it wit only one day acclimatising. While I was fairly out of breath on the final climb to the summit of Mont Blanc, I didn't feel at all unwell during any of the climbing and had only a very mild headache while staying at the Gouter.
Hope this helps.
Post edited at 03:25