I have some own experience of doing overhauls "semi-professionally". Considering the hours required vs a reasonable price for the overhaul, this is more in order to support my local (european) clientele than actually earning anything.
Whilst pondering whether to do a full overhaul yourself or not, consider:
- how good you are at fine mechanics
- that you should be prepared to use several hours, or more, on the overhaul
- that it is wiser to document the bits and pieces before you tear them down
- that different housing models (even under same brand) vary in internal complexity
- that although most parts are relatively straight forward, some might be surprising difficult to reassemble in close quarters
- that at the middle of the overhaul you might realize you need an additional tool or spare part, thus leaving the project on the bench for a while
- that eventhough all the sealing surfaces and shafts might be clean, there might be corrosion elsewhere, e.g. preventing removing a knob or an external lever
- that despite best efforts the newly reconstructed housing might develop a minor leak that might be difficult to locate
- that after reassembly some of the controls might become stiff/jam at depth depending on a number of factors and that you'll need to analyze and solve the problem(s)
The points above originate from actual cases, i.e. this is not a service sales pitch.
Finally, you wouldn't believe how much peace of mind you get by performing a proper hydrotest to the rated depth.
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