I don’t know if you’ve ever done this before but I’d begin by:

1. syncing your own bitcoin node 
2. syncing electrs, which is like a search engine for the chain that other apps can use
3. install Sparrow on a different machine and connecting it to your node by connecting to electrs
4. Install your own mempool.space instance

Then using that setup to transfer SMALL amounts of sats in sparrow to say blue wallet and back till you get confident.

Once you get there you can play with multisig in sparrow and get the hang of that too.