Create a tentative schedule working backwards from that date. Include dates for completing main tasks.
Give extra time in the schedule for minor setbacks between tasks.
Give extra time in the schedule for a potential major setback overall.
For example, let’s say the goal is to paint a house:
I can say I want it painted in 2 months, so I set it for the date of 9/17/24.
I figure I can paint a room every other day, so since the house has 5 rooms total, I think I can start painting 10 days before on 9/07/24. However, I need to consider that finding and purchasing paint and equipment will take time too. I think about it and consider that paint shopping can take me 2 days since I want to try out several stores, so the newer date is 9/05/24.
Now, I add some room for minor setbacks between each task. Rather than assuming I will paint every other day, I add two days in between. That means starting on 8/30/24. This allows me to take my time with rooms, skip a day if I feel tired, or adjust if I the rooms take longer to paint than I had anticipated for whatever reason. I also increase the time allotted for acquiring materials because so many things can happen: traffic, tired, unhappy with selection, need time to test samples and ask people, etc. Rather than only include 2 days for this, I include a whole week so I can see the paint samples on the walls and see which ones feel the best. We are not starting on 8/23/24.
Lastly, maybe something major could happen, such as getting sick, the store runs out of paint stock, my car breaks down, or I change my mind on one of the paint colors after seeing it up on the wall. I might even realize that I completely overlooked tasks, such as rearranging furniture, painting over errors/accidents, and clean up. I would then add a cushion of 2 weeks to the schedule to allow for that should it happen. So the actual start date is 8/9/24. This is much sooner than if we had gone with the original start date of 9/07/24, almost an entire month!
With this style of planning, I can take my sweet time, enjoy the process, and not get stressed out if something unexpected comes up. If I finish early, then I have extra time to work on details or enjoy the rest.