I second this, but with a few things I wish I would have known:
- Before you hope on SoulSeek (with an application like Nicotine+), please study up on the etiquette - downloading someone's shared files without sharing any files that they can choose to download for their collection is called leeching, and while some people don't really care, a lot of SoulSeek users will get really angry if you do this because they're giving you their internet bandwidth for nothing in return.
- To share files, you have to port-forward; be sure to check your ISP's terms of service. I hear that as long as you're not using a huge amount of bandwidth, even stricter ISPs can be pretty lax on enforcing their anti-p2p rules, so you may be able to get away with the risk of breaking the terms of service. However, to truly reduce the risk, you should probably use a VPN.
Of course, there's a whole other ethics of piracy rant I have, but I'd rather not pull it out right now. The main time I used SoulSeek was to download a rip of a rare TMBG CD (like, not a single copy on Discogs and only 1 on eBay).