1. **State the problem:** Simplify the expression $+1 - 5$. 2. **Understand the operation:** This is a simple arithmetic problem involving addition and subtraction. 3. **Perform the calculation:** $$+1 - 5 = 1 - 5$$ 4. **Calculate the result:** $$1 - 5 = -4$$ 5. **Final answer:** The simplified result of $+1 - 5$ is $-4$.