I presume 1-2 lessons a week is because of financial constraints, this being the case, if you cannot fly on a particular day then book for another day of the week or book an extra lesson for the next week - no problem for most people managing up to three trips a day with sufficient break between, above this some get a bit overloaded. 1-2 trips a week should be ok for progress, but the more intensively you can do it the better.
