Im getting there, but no where near as fit as I was, its hard not to overdo things. My surgon was very sketchy on time frames just said as and when I reached goal posts or as tollarated. But a year for full recovery from the operation as its not a minor one just because they are routine. As for function I could expect up to two years for improvements in hip mobility.
So although cleared for work and driving at 6 weeks it didnt mean I could at the level before it will take time.
So its about gradual building up. When I had a part time job at about 8 weeks it was go to work but no additional tasks, then I could do some work and a bit of house work, then a bit latter its been work and then I could also use the cross trainer. The work was local and not very active in a supermarket. I used to work in London in research labs, but, Im not yet fit enough for the long commute and a day rushing about on my feet. I did travel to London for a pre interview interview and commute scared me as you get bumped and pushed and when I get tired Im a bit slow and unsteady on my feet I have to use a cane to highlight to others that I have mobility problems.
As for the cows I helped look after a heard of cows when I kept horses, so I can understand your fear and they can sense it. As you get stronger It will become easier.
To give an example in June last year I completed the Downs link bike ride Guildford to Worthing ~46 miles. I can now do about 11 miles on easy tracks so Im 1/4 of the way there so as Im 3 months out I guess thats on target and its a masive increase on what I was able to do in September.