No matter what changes have been made to the game recently, the process is still the same. Not that the changes have any impact on this (other than a possible nerf to learning new Glyphs which I don't think exists)
Alchemy? Just make some potions, it takes about 30 minutes to level that craft to max, if you have the reagents and solvents. Just use the Mushrooms as they tend to be cheaper, save the flowers for the potions you want.
Enchanting? There is no power leveling, unless you have a lot of gold to buy Rekura's and Denata's. Make Glyphs with Denata's until your at about L30/L35, then when it starts getting painfully slow, switch to Rekuta's. Otherwise, your deconning Mob Loot to level it.
The exact minimum if you want to know is:(Non+Plus/+Plus Subscribed - NO CP Applied)
- 21/19 Clear Water
- 41/38 Pristine Water
- 48/44 Cleansed Water
- 60/55 Filtered Water
- 87/79 Purified Water
(30 Champion Points in the Tower Constellation will add 20% Inspiration gain)