I think the best advice with regard to regularity is find the best balance between flying workload and your financial situation. I flew in weekends as I work full time. Normally I would only fly once on Saturday and again on Sunday. As I got more and more used to being in the air in a small plane I increased the number of flights until I could manage 4 trips a weekend in bursts. It is that sort of regularity that will help you progress. Once a week is not enough because you end up wasting time and money doing remedial flights when you should be working on the next topic in the syllabus.
As others have said, it is not just about getting into the air, you should also be working through your ground studies and getting your flight medical sorted.
But enjoy the journey as you go, sometimes I wish I could do it again (then I look at the costs...
)