Not sure what you mean with ‘the feedback, … and info overload’, but the feedback you get is what Xert advises you to do, based on your improvement rate, athlete type and target date, i.e. in which phase of your training program you are.
There is a learning curve, but compared to for instance TP’s WKO4(5), it’s actually relatively easy.
It comes down to setting the parameters right and (then) put your trust in the system. Admittedly, if you cannot finish any of the workouts, you’ll quickly lose faith, but I’d argue that in that scenario, you didn’t set them right.
Do you have (really) reliable data for at least 3 - 4 months, maybe for this year? I wouldn’t bother uploading years worth of data - the chance of incorrect data creeping in just gets bigger.
The only thing I would check is whether or not your starting parameters in your profile, Fitness Signature and XPMC Settings, are correct. You can adjust your PP, TP and TL to more closely match to what you think is right.
However, make sure that you enter values you are certain of to be correct. PP should be taken from a (fresh) all out sprint, lasting 5-7 seconds. You will not keep - say - 1000 Watts for the entire duration, but Xert will be able to subtract a value, if the effort is long enough. Otherwise, it will get ignored as a spike.
Same goes for TP - while it may seem that this would be equal to your FTP calculated differently, i.e. with other programs, it is actually not 100% equal. However, FTP could be a good starting point, although you might quickly find that Xert will up the number a bit. But not by so much, that you won’t be able to do your workouts.
Other than that, yes: if you’re not up to it on any given day, dial back, do some other - easier - workout or take a day off. Don’t get fixated on what the (daily) training advisor tells you and don’t get tangled into trying to make sense of every number it throws at you, specifically XSS deficits or surpluses.
The color of your stars is also an indication, not a ‘hard’ given. While I have found it to be a little generous regarding my freshness - I’m usually a bit more tired than Xert thinks I am - this is also something that is depending on many other factors that Xert is simply not aware of.
And last but not least: there is a great community of active Xert-ers ready to (try and) help you and an equally awesome support staff. But a good deal of common sense and the good old ‘listen to your body’ goes a long way towards better handling Xert too.
Trust the system, but do not blindly follow its recommendations 