If a recipe calls for 'ready-prepared potato wedges', what exactly does that mean Does it mean the frozen potato wedges you can find in supermarkets, or does it mean fresh potatoes that I've cut into wedges (if so, does that include/exclude the skin, or is that optional?)
"Ready-Prepared" typically means a packaged product.  Many 'ready-prepared' potato products are par cooked and coated lightly in oil before freezing, so cutting your own may be a problem.

A specific recipe would be useful, so that we can give recommendations on how to deal with freshly cut potatoes (par cook vs. adjusting time/temperature of the whole dish)