On the winter target list is tear down & clean the Bigblock for either re-assembling, or sell ....

Questions about thread tools.....
I know there is a difference between cleaning threads and tapping to re-size.
I would like to get a quality set of Tap & Die, with quality Chase & Clean.
However, is this a thing that goes along with
" You get what you pay for "?
Seeing how a set of these would come in handy for anything, not just a single time use, what is the general view of a complete set by brand name?
OR
Should I leave it for the machine shop to handle?
As always, any & ALL responses are taken as educational & helpful.
Thank You...