If you have a good attention to detail, I say try it yourself. Reason being is assembling the axle is straight forward, it’s the adjusting to get it right that takes time. Ask lots of questions here and I think you’ll be surprised that you can do this yourself.
I have done many and others reading have as well. Take advantage of the wealth of knowledge and ask lots of questions.
Between the directions that came with the gears and the supplement in the Techtips section here you’ll have a good baseline to start from.
3:55 swap
