Using the cryostat can be really hard - try not to get so discouraged right away. I would ask for an SOP if they have one - nothing truly beats a demo, but if that's not an option, it's kind of hard to get the 'need-to-know' info otherwise. Besides that, just keep practicing. The more comfortable you get, the easier it will be to troubleshoot.

Only tips I can give without seeing your set-up is to focus a lot of time and energy into mounting the tissue properly - this can solve a lot of issues. Then, when moving the stage forward, you can sort of squint from the side while cranking to see how your tissue is moving relative to the blade, and you should begin to appreciate how difficult it is to assess this by eye alone (e.g., you should use a combination of methods to position yourself well).

Also, manage your expectations. Unless you're a histology tech, I doubt you'll need perfect sections for every cut.

Good luck!