So you can arrange training every day. The reason why the arm parts are arranged separately is that you will get exercise indirectly when training other parts. So it will be difficult to exercise your arms after exercising other parts.
As for whether it will be good to practice every day, it is hard to say whether it will be good. Also depends on your physical fitness. If a person recovers quickly after training, there will be no problem. One thing to remember is not to let the exercised parts rest for too long.
2, fitness can not be urgent, we must step by step. I don't feel sore, because I have adapted to the weight and number of groups I am training now. You can change training methods, weight groups, action details, etc. once a month. You can try another method.
3. It is normal for hands to tremble after training, because muscles will tremble when they are swollen and nervous, and will disappear when the strength increases to a certain extent.
Another thing to note is that different people should sum up their own set of training. There is no standard answer to fitness questions, but they must train scientifically and learn how to use equipment, eat, rest and so on.
I hope it can help your fitness plan. Send me a message if you have any questions.