Not every job can be done with just a ladder -
or by you on your own. So always check:
Are you up to job?
Don't kid yourself by over-estimating your abilities.
If you are not completely certain that you can manage
everything involved in doing the job properly, get
professional help.
This is particularly important if you are elderly or
not fully fit, or not much good with heights - think
about getting someone else to do it for you.
Is a ladder up to the job?
Think ahead to what you will have to do at every stage.
If you will need to move around while you are up there,
or carry lots of materials, or use heavy equipment, a ladder
may not be sufficient.
You might be better off using a mobile tower or scaffolding.