I trekked to the lake alone in winters and it is not much hard if you're decently experienced at trekking in Himachal. Though some of my friends have gone there via India Hikes and their experience has been A1! I don't know much of other trek organizers but this one I can assure you good service by experience.
You can contact Himachal Trekkers at 7807017563/9459850565. I just went on a trip with them to Tirthan. My friend went with them to parashar lake as well. The experience was good but they are a little bit on the expensive side.
You don't need any organiser. When you reach the lake, you can either book a room in the rest house or a tent. Food is also available in the dhaba.
Regarding the trek, it's a straight uphill trek.
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