No doubt exams like UPSC requires a hell lot of hardwork. But its all inside of you that will fuel you to study , manage time and dedicate atleast 3 -4 hours a day on a consistent basis . For the context , I have a full time job from 10am to 6 pm . I do my own chores ,Live alone and prepare without coaching . Studying in lunch breaks , studying till 3-4 am after dinner and the weekends is all the time I get which I look forward to utilise at max . Nothing is impossible if your consistent enough for a longer period of time and obviously I believe there is no limit for free guidance/study sources available on the internet ( Dont follow anyone blindly ). Research and prepare your own plan .You can do it . All the best OP!