Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Any suspected methanol exposure is an emergency.
Contact local emergency services or a poison centre immediately, even if the person feels well.
Get emergency help immediately after possible exposure if there is:
Emergency or poison-centre advice is still needed.
Do not induce vomiting or give alcohol, food, medicines, or home remedies unless a poison specialist or emergency clinician specifically directs this.
If safe, bring the product container or a photograph of its label for identification.
And for anyone, someone who:
Do not wait for symptoms to appear.
Contact the treating service promptly about worsening vision, new movement difficulties, persistent headaches, memory changes, or problems managing daily activities.
After hospital treatment, attend planned follow-up.
The article also says
Move away from methanol vapour into fresh air if this can be done safely.
After skin exposure, remove contaminated clothing and rinse the skin with running water.
After eye exposure, begin rinsing with clean running water.
Every sign above is quoted from the sofidex article on Methanol poisoning. If you are not sure, err upward — it is always reasonable to be checked.