How do I go about rewriting my will

Please accept my condolences on the loss of your spouse. As for your question, you really shouldn't so much "rewrite" a Will as just do a new one. Unless you have some kind of irrevocable trust planning in place, you should be free to do new estate planning documents. Find an estate planning attorney and schedule a consultation. The attorney can help you consider your situation and your wishes, and can then help you develop an estate plan that reflects those and fits you. Ideally, that would mean a new Will, a Power of Attorney, and an Advance Directive for Health Care, to make sure that you have documents in place that will allow someone to help you if you ever become incapacitated as well as a Will that provides for the management and distribution of your probate assets after your death. The attorney should also review beneficiary designations with you, to make sure that those items are coordinated with the rest of your planning.