There are numerous ways to become an instrument-rated pilot. The reason you want the rating in the first place could have an effect on your training method you opt for.
If you choose to enroll in a highly regimented FAR Part 141 flight school, a full-time or part-time instructor could help you at your local airport. If you wish to do an accelerated course, you could have intense training in your own aircraft. However, other instructors usually require you to travel to their location. This can then take around 10 to 12 days.
To apply for an instrument rating, a pilot must:
Hold a current private pilot certificate or concurrently be applying for a private pilot license with an aircraft, helicopter, or powered-lift rating that is appropriate to the sought instrument rating
Read, speak, and write the English language and understand it easily
A pilot must have logged in:
50 hours or more of cross-country flight time as a pilot in command and at least 10 of these hours has to be in an aircraft for an instrument-airplane rating
40 hours of actual or simulated instrument time
15 hours or more of instrument flight training from an authorized instructor in an airplane category for your sought after instrument rating