THR is a good operation for hip issues with success rate upto 100%. This success rate depends on the patients condition, surgical technique, implants and pre-post op rehabilitation physiotherapy.

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Answer for your first question - you have to avoid sitting cross-legged and squatting after THR . 2 .-Usually complications are rare after  proper surgical technique and post operative care and physiotherapy  . Some complications might be possible  like infection ; dislocation ; DVT ; limb length discrepancy chances are less 1-3 % . 3 after Total hip replacement patient can walk immediately; next day . Complete recovery may take 6 weeks to 2 months . 4 usually successful surgery nearly more than 95 % success rate