Help - I've read so much but am still confused!!! What I have : PSP v3.52

What I want:

1. PLay current genuine PSP games which require v3.52
2. Download some games I purchased, to memory and play them

I believe I need to:

1. Downgrade to v1.5
2. Install some kind of patch to enable me to still run my genuine v3.52 PSP games

Problem:

1. Every site I've been too makes no specific mention of v3.52 - v1.5 downgrader, so I'm afraid to run the one offered
2. Can you downgrade, run a patch and run both downloaded and genuine v3.52 games???
3. Need one site that will tell me all in simple english, with exact downloadable files what to do.