Even with a team of 3 4 people you re looking at a minimum of 2 3 full days of work for a full replacement.
Replacing your roof yourself.
Roofing materials are designed to last an average of 40 years.
If you absolutely need a new roof to lower your energy bills and keep water and wind out of your house but you cannot afford it talk to a professional roofer.
If not replace bad wood with new plywood sheathing or 1 x 6 sheathing boards whichever is applicable to your type of roof.
All roofs will eventually become worn and weathered and will need to be repaired in part or replaced completely.
The roof is arguably the most important component of your house.
And while nobody likes having to pay to replace a roof the critical and aesthetic function it serves should help ease the pain of spending 8 000 to 20 000 on the work.
You may be a firm believer in doing some of the work yourself.
If a tiling pro is coming to redo your floors perhaps you d want to rip up the old floor before he arrived.
Make minor repairs on the roof if it is in good condition.