I cross processed the film in C-41 at home which is pretty easy and affordable to do these days when boots is charging 7.99 for pro and prints.
Step 1 - get some slide film, put it in the dish washer in the cutlery holder thing. turn on the dishwarsher and let it run a full cycle
Step 2 - either leave the film to dry in a warm place for 2 weeks or so or in a "dark room" pull it out and dry it with a hair dryer
Step 3 - Expose, slightly over expose as the mask is a bit swollen now I found
Step 4 - Cross process