You can do it.
Replacing hoses isn't a fun job, but requires no real skill, just planning (VERY important), enough math skills to figure out how much hose to buy, plenty of patience, a lot of sweat, a little blood, and enough creativity to link multiple profanities in highly original sequences. The link below includes detailed instructions (for replacing hoses, not profanity).Replacing the macerator gasket (replace the impeller too while you're at it) only requires some manual dexterity and ability to read and follow directions that will come with it. You can avoid sweating while you do that by taking it out and working on it at home.