Great that you have finally got the Shapeoko up and running. No need to remove spindle to change bits if fact I would recommend against it. Just jog it out to the front and change the bit there. I like to make doubly sure the router is turned off during bit changes by making sure the power is "off at the wall" as well as on the router itself.
The spindle can be moved 'slowly' in x,y and z by hand with the electronics unpowered. There is some suggestions that doing this could destroy the stepper drivers. IMHO this may occur with rapid movement but is OK with slow movement.
DO NOT however attempt to move when powered up.
Yep! Vectric Vcarve trial won't allow you to make (that is save a gcode file). From memory though it will allow you to access and use all the tools and the simulation to get an idea of just how it all works. The following is from their website (the emphasis is mine):
The trial versions will not allow you to save a toolpath for your CNC other than the special sample files that are included. However any files that are created and saved with the trial versions of Cut2D, VCarve Pro, Aspire or Cut3D can be opened and made fully operational once you purchase and install the full version of the software as long as it is installed on the same PC as the trial version software.
I wouldn't quite agree.. One can do almost anything but save toolpaths with this trial product. But then I guess not being able to save at least one or two toolpaths for machining could be described as being a bit limiting.