I bought a bunch of i117 Sparks gear for my 99THF/DNC and was able to solo most of the Assault missions just on my own using this guide. However, there are still I have yet to complete, and I'd appreciate any help I could get.
Here they are:
http://i.imgur.com/b4DlUzs.png
Some notes from previous attempts at a few of the above un-highlighted missions:
Lost and Found is hard solo (0/4 so far), and basically a matter of luck, since the one hint you get is who the buried treasure is closest to. This is definitely one where, the more people doing it, the easier it can be.
Building Bridges was hard solo, both because of the time limit and the fact that if you are seen, you get warped to the start. Granted, the more people I had to help me, the less spots we'd each individually need to tag. In the end, I hit all 4 solo but got warped on my way to the final release point and it was over after that.
Operation: Black Pearl I can't do as a THF. I do have a BLM so I could try it on there but that one (and also Escort Professor Chanoix) definitely aren't ones I can solo the way I've been trying so far.
That's just the ones that jump out at me as being troublesome. The others I haven't completed but didn't mention I can still give it a go solo, but the ones I did mention above are really a drag and I'm hoping some people can help me complete them.
If anyone has friends that wouldn't mind helping me knock those last remaining irksome Assaults out of the way, I'd be super-grateful! I am on Phoenix :)