Short of a devine intervention there is no good way. Alder just has alot of pent up energy, no two ways about it.
With the blow down situation you have added a huge deal more to what was already there. What I do, first and foremost stay out of the known bite and uphill. Then start at the top and chunk your way down. Like you said if you can, keep a barrier of some sort between you and the tree. Get down low and look, many times I have see stuff not noticed before by getting onto my hands and knees just to have a different look see. You are the boss of yourself, I have been fired for refusing to cut a chunk of wood and that was an ALDER. If you can chain it up and drag it with your truck as far as possible. That may change the stress points or if you are really luck it may even pull enough to clear the road. Or push your truck into it and relieve some pressure that way. If you have to try small test cuts, I know it doesn't take much for a full on explosion. Try cutting several small cuts in an area to try and relieve some of the pressure.
Alder, anytime anyway scares the beejeebers outta me. Maybe thats why it seems addicting though. It is probably my favorite to cut next to big fir. It will always keep you on your game and your melon screwed on tight, cause if you not, your not gonna be in the game awhole lot longer.
What ever you do do it so you will be home to work on the Money Pit every nigh and weekend. Keep your riggin straight and you lid on tight. Listen to your gut, if it tells to walk away do it. Some one else will cut it out of the way or it will be there when you come back. Don't forget that your saw is not the only tool you have on hand, ropes, chains, vehicles, you name it any and everything can be employed should you need it. If close enough ask for help, more than once we have ran the cat, skidder, crummy, shovel, heck we ran a stroker down one time to help a fella.
Besides your just a girl, think how macho those burly loggers would feel if'in you came back to ask for help. Boy I can see it now, would that ever be a rooster show, all puffed up to help the little missy.
Above all be carefull, and use caution. We would like to get a photo in the calendar we're gonna make at the PNW get together
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Owl