A will should also name your executor or executors. This is the person or people who'll be responsible for your estate. An estate is everything you own: savings, investments, property and any debt.
Depending on your instructions, and what's in your estate, being an executor can be a lot of work. It's important that you choose an executor(s), discuss your decision, and make sure they're comfortable with the job.
Ask a solicitor or accountant to do it if you don't find anyone who feels comfortable. It's important to get independent, legal advice before you do that, though.