Hi @SalmanHaider, There are too many variables here to come up with a 'how-to' list of steps, I think.
I find it easier to judge when I'm paying someone else to do work because I'll have a good idea how much effort and time I would use myself - so the rate that I'm quoted doesn't matter so long as certain 'milestones' are being met.
It'd be great to hear your views of course !