I am currently working on a puzzle, that will inevitably have some manual repetitive tasks in parts. To eliminate this, I am considering doing the tasks myself and putting it in a pastebin. When the puzzle has been solved up to the correct point, I will release the pastebin link so solvers won't have to do it themselves. Should I do this though? Would it be better if solvers completed the whole puzzle by themselves?
An enthusiastic yes to a thoughtfully considerate, generous and liberating idea with value well beyond repetitive tasks!   This question could more broadly be redubbed:
Here are some benefits of the suggestion in question — that a puzzle’s poser provide results of laborious portions of the solution, at pose time or later.
It is considerate to reduce the un creative effort required to fill out mechanically-derived details.
It is generous to share results of mechanical labor that already went into creating and test-solving the puzzle. Usually the poser has generated such results much more efficiently than solvers would think of or even have good tools for.
It is liberating to be able, with a clear conscience, to create puzzles with many details when onerous ramifications of those details are not burdened upon solvers.
Such results can readily be supplied in the form of an auxiliary answer to the puzzle — such as a “wikified worksheet”— here rather than off site when possible. To answer as a community wiki not only averts a taint of vote begging but also encourages solvers to share results of further efforts.   Such an answer can exploit other benefits as well.
Help clarify the puzzle while allowing the original statement to remain relatively concise.
Exemplify a format for solutions.
Highlight clues and provide hints, both overtly and subtly.
Help divert solvers from extensive efforts along false leads.
Please add to this list, as existing examples or, even better of course, as newly created examples.
Wikified worksheet – Not only laborious but drenched in clues and unstated hints.
ABC - A Blokus Commitment – An excellent example of broader uses for auxiliary answers, which further spurred additions from others than the poser.
Examples of perfect boards – Invaluable clarification of the puzzle.
Examples of related solutions – Both a clarification of the puzzle and a helpful guide to solution.
Some string of letters – The first puzzle where I experimented with this kind of approach.
Initial worksheet/hint – Provided after a week of no apparent solution activity, and after suspecting that the puzzle came off as a vomit cipher.   Not the best example, being inadequately introduced, this worksheet was not readily recognizable as an attempt to be helpful.
Converted to a making-of wrap-up – Seemed like a good new purpose for the worksheet after the puzzle was solved with no discussion.
Third timer’s a charm – An essentially simple puzzle whose unfamiliar nature required such an unwieldy setup that further explanation seemed susceptible to collapse under its own weight.
Sample solution – Effectively just a continuation of the puzzle statement.
Some manual repetition is likely okay, buuuut... please be respectful of solvers' time.
I won't elaborate a whole lot on that, because it's more true if it's left as an intuitive general principle. But if you think there's a part of your puzzle that's going to take a lot of time and work slogging through fairly unrewarding manual trials, consider that the puzzle might simply be better if it weren't there.