I concur with both of the above as to itinerary order and in general, dispensing with guide. Redraft with days reallocated around and resubmit for next round of commentary.
You definitely have enough time to get this improved.
Assume bullet train Beijing-Shanghai and flights for the Hangzhou-Xi'an, Xi'an-Guilin, and Guilin-HK portions. Heed moondog's warning to allow enough time before/after the flight itself. I'm not enthralled by your day planning so far. And staying in Guilin for two nights while planning to do both a Li River cruise to Yangshuo and the Rice Terraces ain't gonna work logistically, not enough time.