Hey Prerit, You can reach kullu from manali first and then start your Trek ... The entire uphill is about 3kms of Trekking from chansari ...You have refreshment centres till the upper point of the Trek to temple ... Also a can can be hired from kullu to a place called Halleni and the walking distance from there s exactly half of the trek ... Who can't trek can take a motorable road from naggar via jana waterfalls road ... You can also read this blog from India Hikes people about all the details of this trek:- https://indiahikes.com/documented-trek/bijli-mahadev-to-naggar-trek/ Happy Trekking and Happy Travelling Bro !!!
Take a bus from kullu and reach Chansari village(26KM).It will take upto 4 hours to reach the top from village.Do camping at night and come back the next day.