Well, I'm not sure about Guhong, but my Zhanchi barely needed lubrication. They are made so well that lubrication is almost unnecessary. Your Guhong will work way faster than you anyway.
My suggestion is you get the cube, but use it within your limits. Nobody said that just because you have a fast cube that you can't slow down. Get a metronome and learn proper fingertricks. Learn lookahead and understand what you are doing. Don't try to learn every alg in one night. Go maybe one or two a day and work within your limits. I'm sure you are super capable of becoming quick but its not gonna happen today. Nor tomorrow. I don't know how quick you learn but do it all at a pace.
You will be a good cuber if you have the right attitude. Perfect practice makes perfect. Amateurs practice until they can get it right. Pros practice until the can never get it wrong.
Get the Guhong, but use it right.
But most of all dude, have fun. It is so satisfying to cube and to solve. Enjoy it. Celebrate the victories man.
Have fun and happy holidays
EDIT: Oh yeah, forgot to add, Kirs right. Fast cubes can be turned slowly. Its all in the way you practice.