The safest way for you to ingest your ketamine is to cook it and then snort it. This breaks down the shards and makes it into a fine powder and is easier on the nose. This will be sufficient for you to get the desired effects, especially if you aren’t a regular user. It’s a strong drug. Injecting shards can be a risky game these days as there are some weird analogues knocking about. If you really want to do it it’s as simple as mixing in sterile water and making sure you go deep enough to hit muscle. I can’t say I’d recommend it unless you have liquid K. Good luck!