CFW 3.55 and 4.11 DEX

Hey guys, been awhile since I came here to see what's going on in the scene!

I've been reading about the new DEX method but I've come across some questions that I can't answer 100% and I'd like your help with links to posts or whatever that might give me (and others with the same questions) a clue!
Beforehand I'd like to say I don't have TB, don't have E3 flasher, only an old P3GO laying around! So dont tell me to do this or that with some gadget, 'cause this is the only 'stuff' that I got :vollkommenauf:

So now, to the questions:

1- Can I play backups like I play on 3.55? (I've been reading you can only play 4 at a time :( )

2- Suppose I go through with the 4.11DEX, can I return easily to CFW 3.55? What do I lose more in the process than only 3.56+ backups?

3- Do I lose all my internal HDD in any of those processes?

4- Do I have to prepare ALL the games in 4.11DEX or is there an noob-friendly app that can do it?
I've seen an update here for a 4.20DEX, is it worthwhile or just keep with
4.11?

5- Does REBUG CFW useful in this matter? Since it has CEX-> DEX capabilities?

Sorry if the questions are too noobish, but I dont wanna risk a lot of work and a PS3 with them :vollkommenauf:

Thanks in advance :love: