Yes, in Nigeria, a landlord can write a quit notice to tenants without the involvement of a lawyer. However, it's essential for the landlord to ensure that the content of the quit notice complies with the legal requirements outlined in the applicable tenancy laws. These laws vary by state in Nigeria, and there might be specific provisions regarding the format, duration, and grounds for issuing a quit notice. Landlords should familiarize themselves with the relevant tenancy laws in their state to ensure that the quit notice is legally valid. While legal advice is not mandatory, it can be helpful to consult with a legal professional or refer to legal resources to ensure accuracy and compliance with the law when drafting such notices.