On page 37 of EdWort's ApfelWein thread, you will find that I've consolidated nearly all the posts into a simple question-answer format and most of what you want to know is contained therein.
About using a secondary. Normally the purpose of the secodary is to get the beer away from all the sediment (trub) that settles at the bottom of the fermenter so the remaining fermentation can take place without drawing odd flavors out from the sediment (or from the plastic bucket, if you are using one for a primary). Since you are using juice, there really isn't any trub to speak of, so it's not really necessary to transfer it to a secondary unless you are using a plastic fermenter. If that is the case, you
may want to rack to a secondary, but not everyone thinks it's necessary. You can just let it sit for a few weeks in the primary.
About checking the S.G. after 5 days. I guess you can check the SG so long as you sanitize your equipment and are careful not to breathe into it or cause a mess. But why would you want to? What is there to gain by checking the SG when everything looks perfectly normal and the airlock is bubbling away? You know it's working, you know it's not finished yet, and you know that you are risking an infection by taking a measurement. So why would you do it?
About clarifiers. My understanding is that clarifiers are used to help precipitate junk out of your beer. However, since your apple juice began life as a clear liquid, it will more or less return to that state after the yeast is done fermenting. It will eventually become quite clear, but since the yeast is still working, it's not going to do be doing that yet. Can you add clarifiers? Sure. Is it going to help much with this recipe? I doubt it. Once the yeast is done, you will have clear hooch.
According to all the information in EdWort's Apfelwein thread, it takes about 4-5 weeks before it'll clear. The clearing occurs when the yeast dies and stops doing its thing. So, since you've still got bubbles, it's not going to be clearing yet. The yeast is still active. I'm on about day 12 with my recipe now and I've gone from a bubble per second to a bubble about every 6 seconds. But it's still bubbling, so the yeast is still active, so it's not clearing. Fruit wines take considerably longer to clear than beers.
FWIW, EdWort's recipe is my first "brew" as well. I've seen this phenomenon in other hobbies, though. A lot of people are just impatient. I believe that it's natural to obsess about a new hobby that excites you, but I believe that if you buy into all the hype and buy every last gadget, supplement and doodad then, at best, you will wind up spending money unnecessarily in the process. At worst, those purchases will wind up being a crutch for you to lean on and will actually prolong your quest to become good at your craft.
The recipe says to wait a month and after a week people are already worried that their efforts have not paid off yet. It doesn't matter if we're talking about beer, bodybuilding, guitar, or whatever, people want things to happen faster for them than for anyone else. They want to speed up the process. I know bodybuilders want to start taking extra pills or supplements if they don't see an improvement after 2 days. Guitarists figure they need new strings, picks, or a tuner if their music sucks. Apparently brewers feel the need to check S.G.'s and buy clarifiers. lol
Personally, long term, I think this is detrimental to your enjoyment of the hobby because if you keep it up, you may eventually burn out. So my advice (besides RDWHAHB) is to get yourself another hobby so you can stop obsessing so much about this one.
Just let nature run its course. And I'm not saying it's just you. A lot of folks are doing that. I, too, find myself having to resist the urge to go check on my carboy 30 times a day. I can't help it. It's natural. I even busted out my hydrometer and got very close to taking a reading myself before common sense prevailed and I put the hydrometer back in the drawer. I followed the recipe (more or less), everything looks like it should, so I'm not worrying about it, I'm not messing with it. I'm trusting that the recipe will work just as well for me as it has for countless others.
Remember, the longest journey begins with a single footstep...
Cheers!