The blessing is not in play until the conditions to create it a met, IE, you have enough favour. Until that time the card is sort of "in limbo" so it is not actually "on the table" to remove recharge counters, or have any effect.
An example is probably the best way:
Helmut Thane, priest of Sigmar (Willpower 4) attempts to invoke the Blessing of his God!!
He starts at 4 faith and on his turn plays Righteous Strength to better smite the foes of the Heldenhammer.
At this point, Helmut's player declares his action and rolls the appropriate dice (an Invocation check) Helmut has a gold dice in Invocation and is 1 stance into reckless. so he grabs 1Gold,1Red and 3Blue dice, He also grabs one purple dice as indicated on the card for difficulty. After examining his dice pool He has a total of 2 successes, a comet (lucky boy!) but bane and a fatigue.
Helmut's player immediately suffers the one fatigue from the dice roll and one from the bane and places his 4 faith on the card. At this point however the blessing is not actually "resolved" as not enough faith has been generated to power the effect. Noting the effect of the comet, and knowing that his companion Yuri the damned, a crazed Troll slayer has not acted yet, he assigns the comet effect to him and attempts the Curry favour action as well! Again Helmut creates his dice pool, this time based on his Piety. As a pious follower of Sigmar he has 2 gold dice this time. His pool is therefore 2Gold, 1Red and 3Blue. He also grabs 1 purple for the difficulty of the curry favour action, and an ADDITIONAL purple for hurrying his action.
NOW, lets explore a few outcomes here.
1: Helmut rolls his action and achieves a success! At this point he places the 2 favour gained on the Righteous Strength action card and it now resolves as it now has the required 6 favour. At this point the card "comes into play" and gets its 4 recharge tokens and Helmut and Yuri now get +2 damage to all their melee attacks while the card is recharging.
2: Helmut achieves 2 successes and the 2 required faith go onto the card and the affect triggers as above. Helmut ALSO places the 2 additional faith generated into his pool.
3: Helmut fails (probably for spending time with non Sigmar fearing companions ) and the effect and the card do not enter play at this time.
This leads to 3 outcomes during the end step of the round.
1: As the card is in play it loses one recharge token and Helmut, now at 0 faith gains 1 faith to move towards equilibrium.
2: Same as above, but Helmut goes from 2 faith, to 3 faith as he still is below equilibrium.
3: Helmut gains a faith, which is immediately placed on the blessing, but as it requires 6 to trigger it is not "in effect" so provides no benefit to Helmut or Yuri, but also does not loose any recharge tokens either. He ends the turn with no faith.
There are many variations on this depending on your results from your action, but that is pretty much how it works. Where this differs from a Wizard however is *When* the steps occur. For a Wizard, he has to have the power "upfront" to attempt the spell in question, so he channels first if he needs to, whereas the Priest does the action first and then needs the "power source"
Hope this helps bro!!