Experimenting with Tantra practice is not recommended.
If interested in Tantra, it is wise to consider taking initiation into each specific Tantra practice from a qualified Tantric Master.
The practice of Anuttarayoga Tantra (or any other aspect of Tantra, for that matter) needs insightful guidance.
The same goes for Mahamudra, Dzogchen, and especially for Chöd practice.
Here are some resources: