I hate to say it, but you can really screw up your dog by practicing watch and bite on an inexperienced helper without direct supervision. I certainly wouldn't do it. It would be much better to wait until you are ready to train on a regular basis. Starting with an untrained dog is much better than having to try and fix a screwed up dog once you are able to get back into it.
Okay, this bothers me. I'm going to say why.
I made this thread with the best intentions for my dog. I asked several questions, none of which have been answered. Instead I'm being grilled with questions and given orders. While the "advice" given here might be relavent, and I just might screw up my dog if I worked on pass auf/packen at home after being shown how, none of that really helps get me anywhere with training. I asked for help with perch work, help with distractions, and help with the "touch" command as well as help with the other things. None of that has been answered.
The posts are judgmental in tone, contribute absolutely nothing to this entire conversation, and show a desire to lecture/judge rather than actually help. You could have said, "Hey here's all I know about perch work, here's a helpful video" and tagged onto the end "Also I wouldn't work on the schutzhund commands without an experienced helper around". That would have been a nice way to do it, as well as a helpful and constructive way that changes the tone of the conversation. Instead you immediately created tension by asking accusatory questions.
Think about this: if I was a new poster coming on here to ask this question, and I fully intended to train the dog with these command regardless of what people said/thought, the only thing your posts would have done is drive me off of this forum to get advice elsewhere rather than trust you.
I have seen nothing helpful in this thread. No helpful tips for perching (which I know
is thought of positively by many people on here), no tips on touch, and nothing about working in distraction. Another thing is I know many dogs that are taught the perching and touch commands that have never done agility in their entire lives. They're not screwed up, in fact they are well behaved, love doing tricks and think it's all fun. Why does the reason I want to teach my dog a simple trick have any value in regards to whether or not you give advice? Perching is harmless, just like "stand", "sit" and "down" are. It's just teaching a dog to put his or her body into a certain position and move it.
If anyone who actually wants to help me with the other things is willing to post, then please do so. For the rest of it I'll talk to a knowledgable trainer and work on it with them. But for the love of all things pawsitive, please do not come in here with interrogation on your mind.