The walk is well signposted, so don't worry. The walk was very enjoyable (although long), you don't need any intensive preparation beforehand.
These are the walks in this video: Watsons Bay to Rose Bay walk Spit to Manly Bondi to Coogee Manly to Dee Why Watsons Bay to Bondi. You are right near the water and look across to Bare Island and La Perouse. Easy gradient so not taxing, and a nice cafe (Bella Vista) for mid point coffee and treat. A very pretty interesting walk. It is a easy walk and lots of interesting info on the way. Great views of north head from. There is an information.
️ This Bondi to Coogee walk is your Sydney must-do! Craving an adventure beyond the guidebooks? To get here, take the trail from Bundeena then walk along the scenic coastal path for about kilometres. The path of the coastal walk is safe, with lots of stairs. Witness stunning coastal views. We didn't make much stops after, because going down further means we have to climb up.