Road from Mandi to Baggi was drive-able with decent conditions of roads. You can go on self drive also if you can figure out the route. Baggi is one of the points from where the trek starts. There are many more points too. One can explore and find the best one for yourself. There are various tour operators which operate from this point as well. You will find two small cafe to eat, freshen and few ration shops here to store and stack up any needs for the trek. Do not forget to carry water, trekking sticks and some warm clothes. you can also choose to leave your extra luggage at one of these cafe if you don't need them during or after the trek. It is available once you talk to the people at cafes there.
The trek from baggi looks simple as its is not steep initially and you walk on the river bed. But for those who don't want to trek, can take a car and reach parashar too.
I would rate this trek medium. It is steep at some places. And if it rains or snow, then the slippery leaves and mud can be difficult to climb or trek on. its a 5-6 hour trek of 7 Kms approximately.