to be harvestable, must one be generally full of joy??

[EvolvingPhoenix]

Broadly speaking, I'd say Wanderers don't have to worry much about the Harvest.  Yes, it's possible for them to get so far off-track that they end up caught up in the planetary energies\incarnation cycle again, but for a variety of reasons, I honestly believe there's a fairly low probability of that happening.  

After all, Hitler ended up going back 'home' and undergoing healing, rather than getting thrown back on the wheel.  Not to mention, if the statistics Ra quoted in 36.24 are still accurate, less than ten percent of Wanderers actually come into full self-actualization, with the vast majority simply spending their lives feeling like misfits without seeing through the 'illusion' of physicality. It's hard to imagine why anyone would go Wandering if they seriously had a 9-in-10 chance of getting stuck back in the reincarnation loop!

The Harvest on Earth itself is for 3D entities who may be ready to advance to 4D for the first time.  For Wanderers, Harvest-time is merely a period with huge amounts of catalyst which can speed up their own development and work towards whatever goals they're trying to accomplish.  

As for those who do end up 'swept into the maelstrom'?  My basic belief is that only happens to Wanderers who outright "devolve" during their time on Earth.  They don't merely forget the higher lessons of love\wisdom\unity they were trying to bring with them.  Rather, they end up behaving in ways so contrary to those lessons that they effectively regress into a lower form of existence by altering their energy patterns so radically that they no longer "fit in" with their home density and\or S-M-C.

And if this seems ancillary to your question, the point I'm basically making is this:  Don't stress the Harvest.  Worrying about whether you're "saved" is just going to increase negative feedback loops in your psyche.  That, in turn, makes it far harder to embrace love and joy.  If you're here, and awakened enough to think you're probably a Wanderer, you're almost certainly also awake enough not to get swept up.

(So there's something to be happy about right there! )

I worry that if I don't heal from my issues regarding the friendship breakup, I'll have to reincarnate just to learn whatever I have to learn to heal.

I should also note as a side thing that Ra didn't say Hitler was healed instead of reincarnation. He said Hitler had to undergo healing rather than harvest. Hutler didn't go "back home" anywhere.