Double sided seems like it would be really hard to pull off well..
Getting the positions right would probably be really hard..
Will try it sometime.
Some crucial tips I can give you:
Use glossy photo paper or paper from a magazine.. THIS IS A MUST IMO!!
Crank up the contrast and darkness on your LASER printer.. not inkjet
Use the highest heat setting on your iron .. press very firmly when ironing..
Remember to iron each section equally.. Iron for at least 20 min (depends really)
After ironing soak the board in WARM water for at least 20 minutes..
I find that really cold water makes the paper curl off..
Peel off what paper you can.. rotate your thumb in a circular motion on any paper that sticks.. you can be pretty rough if the toner stuck..
Use warm etchant .. place the etchant in a plastic bowl with the copper clad board..
The biggest mistake I made was not rocking the bowl during etching.. always keep the bowl rocking back and forth! This speeds etching ten fold..
After the copper which is not covered with toner has vanished.. Wash off the black toner with .. I like to use a rough metal scour .. You can get them at the department store (usually used for washing dishes)
Now I like to use a magnifying glass and very sharp box cutter.. find any shortouts and firmly separate the connect.
I also like to use my multimeter and perform a continuity test on the whole board.. Wouldn’t want to search for discont. after 100's of components are in place!
Next, using the original layout on paper and a drill press... I drill out the holes..
Then give it one more clean.. and your ready to populate the board with the components..
I recommend the FREE version of Eagle PCB layout designer by CadSoft
After the board is done.. you can protect the copper from oxidation by spraying silicone comformal coating..
For etching I use Ammonium persulfate with AMAZING results
Good luck with your projects dasatboy,
and be prepared to make many mistakes!
Here is a board I made today: