If you are looking for datasets from amateur astrophotographers to practice with, there are a number for useful resources.
Processing is meant to be fun! If you really need help with a particular dataset, jump on the forums or contact us directly for some pointers - even if you're just using the trial.
Thank you StarTools for turning my average photos into amazing ones.
The motion is configurable both by you and the viewer in both X and Y axes.
The Filter module allows for the modification of features in the image by their colour by simply clicking on them.
You can convert everything you see to a format you find convenient. Give it a try!